88M Tractor Trailer and HEMTT Practice Test – All Questions

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Choose the Right Actions Before Coupling a Tractor TrailerWhich of the following actions is NOT performed prior to coupling procedures?Choosing the Right Component to Secure Your Container on the M872AWhat component is used to secure a container to the M872A?Discover how many batteries are in the M1120 HEMTTHow many 12 VDC storage batteries are in the M1120?Discover the Capacity of the M872A4 Heavy Equipment TransporterThe M872A4 has a ____________ ton capacity.Discover the Engine Behind the M1120 Military VehicleWhat type of engine is utilized in the M1120?Discover the Key Benefits of Regular Tractor Trailer MaintenanceWhat is a key benefit of regular maintenance on tractor trailers?Discover the M1120 Engine Oil Capacity and Its ImportanceHow many quarts of engine oil can the M1120 engine hold?Discover the M1120's Impressive Maximum Speed of 62 mphWhat is the capacity of the M1120 in terms of maximum speed?Discover the M1120’s Maximum Off-Road Towing CapacityIn an off-road application, what is the maximum pulling load capacity of the M1120?Discover the Maximum Fording Depth of the M1120What is the M1120's maximum fording depth?Discover the Power Features of the M1120's CabHow many 12-volt receptacles are provided in the cab of the M1120?Discover the Unique Braking Functions of the M915 Tractor TruckHow many braking functions does a M915 have?Discovering the Collision Warning System of the M915What does the acronym CWS stand for in relation to the M915?Discovering the Importance of Air Reservoirs in the M1120 Air SystemHow many air reservoirs are included in the M1120 air system?Discovering the Importance of the M872A's Adjustable BumperWhat is the purpose of the M872A's adjustable bumper?Explore the Cruising Range of the M915: What You Need to KnowWhat is the cruising range on a full tank for the M915?Explore the M1120 and Its Role as a Tractor TrailerWhat type of vehicle is the M1120 classified as?Explore the Role of the Ether Canister on the M1120What is the purpose of the ether canister on the M1120?Explore the Specifications of the M872A4 TrailerThe M872A4 is how many feet long?Explore the Towing Capabilities of the M1120 HEMTTHow many towing eyes are equipped on the M1120?Exploring the Load Handling System Limits in 88M Tractor TrailersThe LHS is capable of loading and unloading the flatrack from uneven ground slopes of how many degrees from the vehicle's lateral and horizontal axis?How Many Batteries Does the LHS Battery Box Hold?How many batteries are contained in the LHS battery box?How Many Cylinders Should Be Used for Braking on the M915?When hauling heavy loads or driving up hills, how many cylinders should be used to brake on the M915?How Operating the M1120 with Dumped Suspension Can Cause DamageWhat can happen if the M1120 operates with the suspension dumped?How to Ensure Safety After Coupling an M915 Tractor with an M872 TrailerWhat should an operator do to check the connection after coupling an M915 tractor and M872 trailer?How to Reset the Air Cleaner Restriction Indicator Gauge on the M915What is the process for resetting the air cleaner restriction indicator gauge on the M915?How to Safely Connect the Kingpin on Your Tractor TrailerWhat action is taken after releasing the trailer air brakes in order to connect the kingpin?Know the Air Brake Count for the M1120 TruckHow many total air brakes does the M1120 have?Know when to decrease engine speed to idle with the M1077When unloading operations, at what distance should you decrease engine speed to idle with the M1077?Learn About the M1120 Vehicle and Its Primary Military ApplicationsThe M1120 vehicle primarily operates in what type of environment?Learn how to reset the air filter restriction indicator on the M1120How can the air filter restriction indicator on the M1120 be reset?Learn the Essential Steps for M872A Brake System MaintenanceWhat must be accomplished prior to performing maintenance on the M872A's brake system?Learn the Essential Uncoupling Steps for 88M Tractor TrailersWhat step follows disconnecting the air lines and light cable during uncoupling procedures?Learn the Final Step in Coupling a SemitrailerWhat is the final step when coupling a semitrailer?Maintaining Hydraulic Fluid Levels in Your Tractor Trailer is Key to SafetyWhat must be ensured regarding the hydraulic fluid in a tractor trailer?Remember These Key Tips Before Using the LHS Hydraulic Selector SwitchWhat must an operator remember before using the LHS hydraulic selector switch?Securing Cargo Correctly is Key to Freight Transport SafetyWhich aspect is crucial for cargo security during transport?The Importance of Knowing the M872A4's 68,000 Pound CapacityThe M872A4 has a ____________ pound capacity.The Importance of Your Tachometer's Display in Heavy-Duty VehiclesWhat is the significance of the tachometer's display?Tips for Positioning a Semitrailer to Master Alley DockingWhat should you avoid doing when positioning a semitrailer to conduct an alley dock?Understand Cold Weather Engine Starting Protocols for Heavy VehiclesDuring cold weather starting, after how many attempts should maintenance be called if the engine does not start?Understand the Best Cylinder Use for the M915 on Level RoadsHow many cylinders should be used for driving on level roads with light loads on the M915?Understand the Different Positions of Traction Control SwitchesHow many positions does the traction control switch have?Understand the Importance of Engaging the Emergency Parking Brake on the M1120What safety feature is important to engage while operating the M1120?Understand the Role of the Fuel Pump on the M915What component sends fuel to the engine on a M915?Understanding Air Pressure Ranges for the M915What is the air pressure range for the M915 during operation?Understanding Air Pressure Requirements for Your M1120What should the front and rear air pressure gauges read before operating the M1120?Understanding Cold Tire Pressure for the M872A: Why It MattersWhat is the cold tire reading for the M872A?Understanding Cube Limitations for Your 88M Tractor Trailer and HEMTTWhat should be referred to when determining if a vehicle's cube limitations have been exceeded before tying down a load?Understanding Engine Cool Down Routines for 88M Tractors and HEMTTsWhich of the following describes the operational routine for the engine prior to shut down?Understanding Engine Cooling Best Practices for Heavy VehiclesBefore shutting down the engine, how long should it run at reduced speed to allow for cooling?Understanding Gear Limitations Based on Transmission Oil TemperatureWhich gear is not available for use when the transmission oil temperature is below 19 degrees?Understanding High Transmission Temperatures in 88M Tractors and HEMTTsAt what temperature does the high transmission temperature indicator illuminate?Understanding How the Tachometer Reflects Engine Speed in 88M Trailers and HEMTTsThe tachometer displays engine speed multiplied by what?Understanding Key Steps in Tractor Trailer Coupling InspectionsWhen coupling to a semitrailer, which of the following should NOT be checked during a 360 walk around inspection?Understanding Load Flags for Safety on the RoadWhat flag is attached to a load that exceeds 4ft beyond the vehicle bed?Understanding Maximum Engine Braking with the High Position of the SwitchIn which position of the engine brake switch is maximum engine braking achieved?Understanding Maximum Overhead Clearance for the LHSWhat is the highest overhead clearance on the LHS with the hook arm fully extended?Understanding Mudflap Management for Towing M969 Trailers with M915What must be done with the M915 mudflaps when towing a M969 trailer?Understanding Oil Pressure Timing During Cold Weather StartsDuring cold weather starting, how long should the oil pressure indicate pressure?Understanding Operator Checks for Flatrack Transfers in 88M and HEMTT OperationsWhich of the following is not a required operator check before transferring a flatrack from the PLS trailer to the LHS?Understanding Safe Operation of the M1120 SuspensionWhen is it permissible to operate the M1120 with the vehicle's suspension dumped?Understanding Service Brake Signals in Tractor-Trailer Combinations for SafetyOn tractor-trailer combinations, service brake signals from what are sent to the trailer?Understanding Sight-side Backing for Tractor TrailersBacking a trailer to the left side is called what type of backing?Understanding Starter Engagement in Cold Weather ConditionsWhat is the maximum time to engage the starter during cold weather starting?Understanding the 5-Second Wait for Tractor Trailer Landing GearHow long must an operator wait to ensure the landing gear will support trailer weight?Understanding the 5th Wheel Slide Function on the M915What is the purpose of the 5th wheel slide/switch on the M915?Understanding the ABS Indicator Lights on the M915How many ABS indicator lights are on the M915?Understanding the Air Filter Restriction Indicator for Your 88M Tractor Trailer and HEMTTWhat color lights the air filter restriction indicator when the air filter is clogged?Understanding the Bands on the M915 VoltmeterOn the M915, how many bands are on the voltmeter?Understanding the Battery Voltage Meter for the M1120AThe battery voltage meter on the M1120A should read between what values?Understanding the Benefits of the M872A Adjustable BumperWhich of the following is NOT a reason for the adjustable bumper on the M872A?Understanding the Best Practices for Uncoupling a Trailer SafelyAt what point should an operator lower the trailer's landing gear during uncoupling procedures?Understanding the Black-Out Service Select Switch in Military VehiclesWhat components are disabled when the black-out service select switch is set to the on position?Understanding the Causes of Chain Link Distortion in 88M and HEMTT OperationsWhat is a probable cause of several chain links being stretched or distorted?Understanding the Center of Gravity for the M1077 VehicleWhere is the center of gravity on the M1077 located?Understanding the Center of Gravity Mark on the M3Where is the center of gravity mark on the M3 located?Understanding the Charge Air Cooler and Its Impact on Vehicle PerformanceThe charge air cooler intakes air to cool which of the following?Understanding the Color of Your High Beam Indicator LightWhat color does the high beam indicator on the instrument panel illuminate when activated?Understanding the Colors of the M872A's Service Air Coupling HoseWhat color is the service air coupling hose on the M872A?Understanding the Components of the M1120 Air Intake SystemWhich component is not part of the M1120 Air Intake System?Understanding the Critical Role of the Oil Pressure Gauge in Cold Weather OperationWhat gauge is crucial to monitor during cold weather operation of the vehicle?Understanding the Engine Brake Settings on the M915 TruckOn the M915, how many settings are there on the engine brake selection switch?Understanding the Engine Stroke Type of the M1120What is the stroke type of the engine in the M1120?Understanding the Engine Type of the M1120 Military VehicleWhat type of engine does the M1120 have?Understanding the Essential Role of the Hydraulic Reservoir in Your 88M and HEMTTWhat is the primary function of the hydraulic reservoir?Understanding the Essential Role of the Trailer Hand BrakeWhat is the primary purpose of the trailer hand brake?Understanding the Essentials for Safe Towing with the M1120What should the driver maintain to ensure a safe towed operation with the M1120?Understanding the Fuel Capacity of the M1120: 154 Gallons ExplainedWhat is the capacity of the M1120 fuel tank in gallons?Understanding the Function of the Fuel/Water Separator in the M1120What is the main function of the fuel/water separator in the M1120?Understanding the Gear Range Displayed by the M1120 TransmissionWhat gear range is shown in the digital display when the M1120 transmission is set to drive?Understanding the Gear Ratios of the M1120 Transfer CaseWhat are the gear ratios for the M1120 transfer case?Understanding the High Transmission Temperature IndicatorWhat temperature triggers the high transmission temperature indicator to illuminate?Understanding the Hydraulic Selector Switch for Your 88M Tractor TrailerWhat position must be selected on the hydraulic selector switch if the truck is to travel and the automatic circuits have failed?Understanding the Idle Speed of the M915: Why It MattersWhat is the idle speed of the M915?Understanding the Impact of RPMs on Your Turbo ChargerWhich component could be damaged if the engine is not run at the specified RPMs before shutdown?Understanding the Impact of the Blackout Service Select Switch in Military VehiclesWhat component of the vehicle is affected when the black-out service select switch is activated?Understanding the Importance of 65 PSI for the M1120 Wet TankWhat PSI must the "wet tank" of the M1120 reach before other reservoirs can be pressurized?Understanding the Importance of Automatic Parking Brake Control in VehiclesThe automatic parking brake control activates when air pressure drops below what PSI?Understanding the Importance of Brake Chambers in the M1120 HEMTTHow many brake chambers does the M1120 have?Understanding the Importance of Hydraulic Systems in Tractor TrailersWhat role does a hydraulic system serve in tractor trailers?Understanding the Importance of Lowering the Landing Gear When Uncoupling a SemitrailerHow far down should the operator lower the landing gear when uncoupling a semitrailer?Understanding the Importance of Monitoring the M915 Transmission Oil TemperatureIf the transmission oil temperature on the M915 goes into the yellow band, what must the operator do?Understanding the Importance of Oil Pressure in Your M1120 EngineWhat is the safe minimum operating engine oil pressure of the M1120?Understanding the Importance of Shutting Down the Engine When Torque Converter Temperature SpikesWhat should be done if the torque converter temperature exceeds 350 degrees?Understanding the Importance of Stopping Before Engaging the Differential LockWhat must an operator do prior to locking the inter-axle differential lock?Understanding the Importance of the 24 VDC Alternator in the M1120What maintains the battery charge for an M1120?Understanding the Importance of the Hydraulic Selector Switch in Heavy VehiclesWhy must the hydraulic selector switch be in the off position before driving?Understanding the Importance of Towing Eye Structural Integrity in M1120 VehiclesWhat is the primary concern regarding the maximum load capacity of the M1120’s towing eyes?Understanding the Importance of Trailer Bumper SpecificationsThe trailer bumper point not contacting the vehicle bumper stop cannot exceed what distance?Understanding the Key Maintenance for Your New M872AWhat organizational maintenance must be performed after the first 1,000 miles have been driven with a new M872A?Understanding the Key Role of Brake Systems in Tractor TrailersWhat is the purpose of the brake system in a tractor trailer?Understanding the Key Safety Feature of Tractor TrailersWhat is an important safety feature of a tractor trailer?Understanding the Load Capacity of the M1120 in Military OperationsWhat is the maximum load capacity of the M1120 in transportation applications?Understanding the Load Handling System's Flatrack Unloading CapabilitiesThe LHS is capable of loading and unloading the flatrack to how many inches below ground?Understanding the Load Handling System's Role in the M1120 VehicleWhat is the main purpose of the LHS in the M1120 vehicle system?Understanding the Load Securing System in the M1120Which system helps to prevent cargo movement during transit in the M1120?Understanding the Low Air Pressure Warning Buzzer on the M915When would the low air pressure warning buzzer not sound when below 60 psi on the M915?Understanding the Low Air Pressure Warning on the M915 TruckWhen does the low air pressure warning buzzer sound on the M915?Understanding the M872A Trailer and Its Key FeaturesHow many lift eyes are on the M872A trailer?Understanding the M872A Trailer's Lift Eye ConfigurationHow many total lift eyes does the M872A trailer have?Understanding the M915 Fifth Wheel and Its Role in Military LogisticsThe M915 fifth wheel is used to transport which of the following trailers?Understanding the M915 Transmission Warning Light Activation TemperatureAt what temperature does the M915 Transmission warning light come on?Understanding the M915's 12-Volt Utility OutletThe M915 comes equipped with a ________volt utility outlet.Understanding the M915's 65 mph Performance on Level RoadsThe M915 can maintain a speed of ___________ on level roads.Understanding the M915's CWS Side Sensor Range for Safe ManeuveringWhat is the M915's CWS side sensor range?Understanding the M915's Speed on a 3% GradeThe M915 can maintain what speed while ascending a 3% grade?Understanding the M1120 Digital Display and Engine BrakingWhat gear is displayed in the M1120 digital display window when the engine brake is activated while decelerating?Understanding the M1120 Hydraulic Selector Switch for Safe TravelWhat should the M1120 hydraulic selector switch be set to for over-the-road travel after using manual load operation?Understanding the M1120 Traction Control Indicator FlashesWhat happens to the M1120 automatic traction control indicator when the traction control system is activated?Understanding the M1120 Transmission Range Selector and Its IndicatorsIf the M1120 transmission range selector flashes the current gear selection while operating, what action should the operator take?Understanding the M1120's Cab Electrical SystemHow many 24-volt receptors does the M1120 have in the cab?Understanding the M1120's Maximum Fording CapabilitiesWhat is the maximum depth that the M1120 can ford without issue?Understanding the M1120's Maximum Limp Speed is Essential for OperatorsWhat is the maximum limp speed for the M1120?Understanding the Maximum Approach Angle of the M1120 – Key InsightsWhat is the maximum approach angle of the M1120?Understanding the Maximum Lifting Capacity of the Load Handling SystemWhat is the maximum lifting capacity of the LHS?Understanding the Maximum Load Capacity for M1120 Towing EyesWhat is the maximum load capacity for each towing eye on the M1120?Understanding the Maximum Operating Range of a Load Handling SystemWhat is the maximum operating range of a LHS with a full tank of diesel fuel?Understanding the Maximum Slope for Safe Loading OperationsWhat is the maximum slope for loading operations on a fore or aft slope?Understanding the Maximum Sustained Speed of the M1120What is the maximum sustained speed of the M1120?Understanding the Maximum Towed Speed for the M1120What is the maximum towed speed for the M1120?Understanding the Monitoring System of the M1120's Air Pressure GaugesHow many air pressure gauges are monitored on the M1120?Understanding the Optimal Coolant Temperature for the M915What is the minimum temperature of the engine's coolant for normal operation on the M915?Understanding the Optimal RPM for Effective Engine BrakingAt what RPM does the engine brake on the PLS operate best?Understanding the Over Speed Indicator for 88M Tractor Trailers and HEMTTThe over speed indicator lights up red when the engine exceeds which RPM?Understanding the Positions of Your Engine Brake SwitchHow many positions does the engine brake switch have?Understanding the Primary and Secondary Air Pressure Gauges in the M915What are the two types of air pressure gauges used in the M915?Understanding the Proper Sequence for Uncoupling IV Connectors on the M915What is the correct sequence for uncoupling the IV connectors on the M915?Understanding the Required PSI for Your Tractor Trailer's Suspension Dump ValveWhat psi of air is required in the rear air system for the suspension dump valve to function?Understanding the Right Moment to Connect Air Hoses and Light CablesWhen should an operator connect the air hoses and light cables during coupling procedures?Understanding the Right Speed for Engaging the Inter-Axle Differential LockBefore unlocking the inter-axle differential lock, what speed must an operator reduce to?Understanding the Right Time to Lower Your Trailer's Landing GearAt what point should an operator lower the trailer's landing gear during uncoupling procedures?Understanding the Right Way to Lower Landing Gear When Uncoupling a Tractor TrailerHow far do you lower the landing gear when uncoupling a tractor trailer?Understanding the Rise of the M1120 Vehicle Suspension SystemWhen inflating the M1120 vehicle suspension system, how much will the vehicle rise?Understanding the Role of 70 PSI in Your Rear Air SystemIn which air system is 70 psi required for the suspension dump valve to function?Understanding the Role of Brake Chambers in the M1120What is the function of the M1120's brake chambers?Understanding the Role of Bypasses in the M1120 Hydraulic SystemWhy is the M1120 hydraulic system equipped with bypasses?Understanding the Role of Slave Hydraulics on the M1120What is the main purpose of the slave hydraulics on the M1120?Understanding the Role of the Air Dryer in Your M1120Which component protects the engine from water and dirt in the M1120?Understanding the Role of the M915 Primary Air Tank Pull LanyardWhat is the purpose of the M915 primary air tank pull lanyard?Understanding the Role of the Primary Air Pressure Gauge on the M915What is the purpose of the primary air pressure gauge on the M915?Understanding the Role of the Turbocharger in the M1120What is the function of the turbocharger in the M1120?Understanding the Safe Duration to Ford Water with a Tractor Trailer or HEMTTWhat is the maximum duration you can ford water that is up to 48 inches deep?Understanding the Safest Way to Connect Air Hoses for M915 CouplingWhat is the safest way to connect the air hoses when coupling a M915?Understanding the Speed Limit for Towing a Semitrailer on Primary RoadsWhat is the maximum speed when towing a semitrailer on primary roads?Understanding the Speed Limit When Towing a SemitrailerWhat is the maximum speed when towing a semitrailer on secondary roads?Understanding the Towing Capabilities of the M1120 HEMTTHow many total towing eyes does the M1120 provide?Understanding the Traction Control Switch Position for the M1120What position should the Traction Control Switch be in for normal drive mode in the M1120?Understanding the Uncoupling Procedure for M915: A Quick GuideWhat is the correct uncoupling procedure for M915?Understanding the Voltage of the M1120 Electrical SystemWhat is the voltage of the electrical system in the M1120?Understanding the Warning Indicator for Flatrack LoadingA warning indicator light activates when a flatrack with a payload of how many tons is being loaded under the worst conditions?Understanding the Weight Limits for the Load Handling SystemThe LHS will not function when the payload exceeds what weight?Understanding Weight Distribution When Loading Your Tractor TrailerWhat is one key consideration when loading a tractor trailer?Understanding What Affects the Stability of Loaded Tractor TrailersWhich factor is least likely to affect the stability of a loaded tractor trailer?Understanding What Happens When Your Hydraulic System OverheatsWhat happens if the hydraulic system overheats while driving?Understanding What Low Fuel Levels Indicate for Your VehicleWhat is indicated when the fuel tank reaches a low fuel level?Understanding When the Brake System Failure Warning BuzzesWhen does the brake system failure warning buzzer sound?Understanding When the High Transmission Temperature Indicator Lights UpWhen does the high transmission temperature indicator illuminate?Understanding When the Low Fuel Indicator Lights Up on Your 88M Tractor TrailerWhen does the low fuel indicator illuminate amber?Understanding When to Perform a Pre-Trip Inspection on a Tractor TrailerWhen should you perform a pre-trip inspection on a tractor trailer?Understanding Where to Load Heavy Flatracks on Your TruckWhere must the heaviest flatrack be loaded on a vehicle?Understanding Why the M1120 Needs to Stop for Transfer Case ShiftingWhy must the M1120 be stopped before the transfer case can be shifted between ranges?What does a Green Clearance Light Indicator Mean for the M1120?What color does the clearance light indicator of the M1120 illuminate when the master lighting switch is on?What Happens If You Use the Trailer Handbrake While Driving?What could occur if the trailer handbrake control is used while driving?What Happens When You Exceed the M1120's Maximum Side Slope?What is the consequence of exceeding the M1120's maximum side slope?What HEMTT Really Stands For and Why It MattersWhat does HEMTT stand for?What is the Maximum Side Slope Percentage for M1120 Traction?What is the maximum side slope percentage for adequate traction surface on the M1120?What Makes Oil Essential for Hydraulic System Operation?Which component is essential for the operation of the hydraulic system?What Power Take Off Really Means for Tractor TrailersWhat does the acronym PTO stand for?What to Do After Driving 1,000 Miles with Your TrailerWhat should be done to the trailer suspension after driving 1,000 miles?What to Do if Your M915 Voltmeter Reads in the Red BandWhat action should the operator take if the voltmeter of the M915 reads in the red band?What to Do When Driving Through Loose Sand in an M1120What should a driver do when traveling through an area with small stretches of loose sand in a M1120?What to Do When the Fifth Wheel is Too Low for the Trailer's KingpinWhat action should you take if the fifth wheel is too low to engage the trailer's kingpin?What to Do When the M915 Transmission Oil Hits the Red ZoneWhat must an operator take if the transmission oil temperature goes into the red band on the M915?What to Do When the M915 Voltmeter is in the Red BandWhat action should the operator take if the voltmeter is reading in the red band on the M915?What to Do When Your Air Filter Restriction Indicator Lights UpWhat is the typical action when the air filter restriction indicator lights up?What to Do When Your Engine Coolant Temperature Gauge Hits 219 DegreesWhat action should be taken if the engine coolant temperature gauge reads over 219 degrees?What to Do When Your M1120 Transmission Range Selector FlashesWhat action should you take if the M1120 transmission range selector flashes the current gear selection while operating the vehicle?What to Do When Your Oil Pressure Gauge Drops in Cold WeatherIf the oil pressure gauge does not indicate any pressure within 10-15 seconds during cold weather starting, what action should you take?What You Need to Know About the Emergency Air Coupling Hose on the M872AWhat color is the emergency air coupling hose on the M872A?What You Need to Know About the M872A Lift Eye Weight CapacityWhat is the weight capacity of each lift eye on the M872A?What You Need to Know About the M872A Trailer's Lifting CapacityLift eyes on the M872A are capable of lifting how many pounds each?What You Need to Know About the M915's Maximum Governed SpeedWhat is the maximum governed speed (in RPM) for the M915?What You Need to Know Before Maintaining a Trailer’s Air SystemBefore maintenance, which specific action must be taken regarding the trailer's air system?What You Should Know About the PLS Alternator's 260 Amp CapacityWhat is the capacity of the PLS alternator in amps?What’s the Maximum Speed for Towing a Semitrailer Off Road?What is the maximum speed when towing a semitrailer off road?What’s the Role of the Air Dryer on the M1120?What is the purpose of the air dryer on the M1120?Why Proper Air Pressure in the Rear System is Essential for the M1120Before fording water, what is a critical requirement for the M1120?Why Regular Engine Oil Checks Are Crucial for Tractor Trailer SafetyWhat must be regularly checked to ensure safe operation of a tractor trailer?

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