Correct answer: D – All three systems
Air brakes consist of service, parking, and emergency braking systems. The service brakes operate through the brake pedal during normal driving. The parking system holds the vehicle when parked, while the emergency system uses parts of the service and parking systems if a brake-system failure occurs.
Source: Ohio Commercial Driver License Manual — § 5, “Air Brakes”
Correct answer: B – False
Reducing your following distance leaves less room to respond to traffic ahead and may force you to brake suddenly. Instead, open additional space in front of your vehicle. This allows more gradual speed or direction changes and can make it easier for the tailgating driver to pass.
Source: Ohio Commercial Driver License Manual — § 2.7.2, “Space Behind”
Correct answer: D – All of these items
A combination-vehicle inspection includes all three checks. The electrical cord must be firmly connected and secured, while the air lines must be properly connected to the glad hands, free of leaks and damage, and provided with enough slack for turns. Ohio also requires these connections to be demonstrated during the applicable trailer inspection.
Source: Ohio Commercial Driver License Manual — §§ 6.2.5, 6.5.1, “Hose Couplers (Glad Hands)”; “Combination Vehicle Safety Inspection”
Correct answer: B – An intersection ahead with possible turning or entering traffic
This is the Cross Road warning sign. It alerts drivers that an intersection is ahead and that vehicles may turn onto or enter the roadway. The Ohio Driver Manual identifies yellow diamond-shaped signs as warnings of possible hazards, while the cross symbol depicts the configuration of the approaching intersection.
Source: Ohio Driver Manual — § 4, “Traffic Signs”, Manual on Uniform Traffic Control Devices, 11th ed. with Revision 1 — § 2C.41, “Intersection Warning Signs (W2-1 through W2-8)”
Correct answer: B – False
Never remove a radiator cap or another part of the pressurized cooling system until the system has cooled. Steam and boiling coolant can escape under pressure and cause severe burns. When opening a cooled system, protect your hands, turn the cap slowly to the first stop, and step back while pressure is released.
Source: Ohio Commercial Driver License Manual — § 2.14.1, “Vehicle Checks”
Correct answer: D – Come to a complete stop and yield before turning
Ohio law permits a right turn at a steady circular red signal after a complete stop, unless a sign prohibits the turn or a steady red arrow is displayed. Before proceeding, the driver must yield as required to crossing traffic and pedestrians. The turn may be made only when it can be completed safely.
Source: Ohio Driver Manual — § 5, “Turning on a Red Traffic Signal”, Ohio Rev. Code § 4511.13(C)(1) — Highway traffic signal indications; section not applicable to railroad crossings
