DGT DGT Speed Management & Distance Control 2 — Questions and Answers
Question 1: On a freeway, what is the maximum speed limit typically posted when passing through a construction zone with workers present?
- 45 mph (Correct answer)
- 55 mph
- 65 mph
- 70 mph
Correct answer: 45 mph
Construction zone speed limits with workers present are commonly reduced to 45 mph or less to protect workers and drivers.
Question 2: What does 'hydroplaning' mean in the context of speed management?
- Driving too slowly on wet roads
- A vehicle's tires losing contact with a wet road surface (Correct answer)
- Braking aggressively on ice
- A sudden increase in fuel consumption
Correct 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.
Question 3: When driving downhill on a steep grade, which technique best controls vehicle speed?
- Applying brakes continuously and firmly
- Shifting to a lower gear and using engine braking (Correct answer)
- Disengaging the clutch or shifting to neutral
- Turning on hazard lights and accelerating
Correct 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.
Question 4: A driver's reaction distance at 50 mph is approximately how many feet assuming a 1.5-second reaction time?
- 55 feet
- 75 feet
- 110 feet (Correct answer)
- 150 feet
Correct 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.
Question 5: Which of the following best describes 'speed matching' on a highway merge?
- Stopping at the end of the on-ramp
- Accelerating to match freeway traffic speed before merging (Correct answer)
- Slowing to let all highway vehicles pass first
- Using the shoulder to gain extra merging distance
Correct 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.
Question 6: What does a 'speed advisory sign' (yellow diamond) indicate compared to a regulatory speed limit sign?
- It is legally enforceable just like a speed limit
- It recommends a safe speed for a curve or hazard but is not legally binding (Correct answer)
- It applies only to trucks and buses
- It overrides any posted speed limit in the area
Correct 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.
DGT DGT Speed Management & Distance Control 2
On a freeway, what is the maximum speed limit typically posted when passing through a construction zone with workers present?