high beam headlights must be dimmed at ___ from oncoming traffic and ____ from a vehicle being followed {Ans: 500ft, 200ft}the ___ of the air brake system protects the tanks and the rest of the system from too much pressure. it is usually set at 150 psi. if it releases air, something is wrong {Ans: safety valve}if a load extends more than ___ past the body of the vehicle a 12 in square _____ must be attached to the load during daylight and a ____ must be attached during nighttime {Ans: 4 ft, red flag, red light}A Class D license allows for a driver-for-fire to drive any vehicle fitting into the Class __ requirements {Ans: E}in newer vehicles, you engage the parking breaks by using this knob {Ans: diamond-shaped, yellow, push-pull knob}The load must be ____ so the covering or load does not come loose, or in any manner become a hazard to other motorists {Ans: Securely fastened}