DGT Speed Management & Distance Control Flashcards

On a freeway, what is the maximum speed limit typically posted when passing through a construction zone with workers present?

Answer: 45 mph

Construction zone speed limits with workers present are commonly reduced to 45 mph or less to protect workers and drivers.

What does 'hydroplaning' mean in the context of speed management?

Answer: A vehicle's tires losing contact with a wet road surface

Hydroplaning occurs when a layer of water builds up between the tires and road surface, causing loss of steering and braking control.

When driving downhill on a steep grade, which technique best controls vehicle speed?

Answer: Shifting to a lower gear and using engine braking

Engine braking in a lower gear reduces wear on brakes and provides steady speed control on steep descents.

A driver's reaction distance at 50 mph is approximately how many feet assuming a 1.5-second reaction time?

Answer: 110 feet

At 50 mph (73 ft/sec), a 1.5-second reaction time means the vehicle travels roughly 110 feet before braking begins.

Which of the following best describes 'speed matching' on a highway merge?

Answer: Accelerating to match freeway traffic speed before merging

Speed matching means reaching the same speed as highway traffic before merging to avoid dangerous speed differentials.

What does a 'speed advisory sign' (yellow diamond) indicate compared to a regulatory speed limit sign?

Answer: It recommends a safe speed for a curve or hazard but is not legally binding

Advisory speed signs (yellow) suggest a safe speed for conditions like curves but carry no legal penalty, unlike regulatory white signs.