Colorado CDL — General Knowledge Practice Test 10

1.When may a driver use a prescription drug and still operate a commercial vehicle?
Only if the doctor says it will not affect safe drivingWhenever the driver feels no side effectsOnly if the driver takes half the prescribed doseAny time, since prescriptions are always legal on duty
2.Three factors together determine a person's blood alcohol concentration. Which set is correct?
Height, gender, and time of dayHow much you drink, how fast you drink, and your body weightThe brand of alcohol, the temperature, and your moodThe food eaten, the altitude, and your age
3.Federal rules limit how a CDL driver may use a hand-held mobile phone while driving. What is allowed?
A hand-held phone as long as both hands return to the wheel afterwardA hand-held phone for dialing but not for talkingA hands-free phone that can be reached and operated with a single buttonAny phone as long as the vehicle is moving under 20 mph
4.As you near an emergency vehicle that is parked at the side of the road with its lights on, what does the move-over rule require?
Speed past to reduce the time spent alongside itCome to a full stop in your lane until it movesSlow down and move over a lane when it is safe, yielding to the emergency vehicleSound the horn continuously while passing
5.An 'active' railroad crossing is defined by the manual as one that has what?
A traffic control device such as flashing lights or gatesA dirt approach with no pavement markingsNo signs or signals of any kindOnly a crossbuck and nothing else
6.One of the three good rules for using turn signals is to signal when?
Only after you have started to turn the wheelWell before you begin the turnOnly if another vehicle is directly behind youAs you complete the turn, not before
7.Why are pedestrians and bicyclists on the road with their backs to traffic a special hazard?
They can neither see nor sometimes hear your approachThey are required to carry their own warning lightsThey always move faster than your vehicleThey have the same view of traffic that you do
8.At a crossing equipped with gates and flashing red lights, when may you proceed after they activate?
By driving around a lowered gate if no train is in sightOnly after the gates go up and the lights stop flashingAs soon as the gate begins to rise, even if lights still flashWhen the bell stops, regardless of the gate position
9.A vehicle with its rear window blocked, or a rental truck whose driver has limited rear vision, is a hazard because of what?
They are required to yield to commercial vehiclesThey have better brakes than most carsThey always travel above the speed limitThey cannot see you and may move into your path
10.A reflective red triangle with a bright orange center attached to the rear of a vehicle ahead is a signal that the vehicle is what?
Carrying hazardous materials that require placardsBeing operated by a student driver in trainingDisabled and waiting for a tow truckDesigned to move much slower than surrounding traffic