South Dakota Permit Test: Speed Limits Practice Questions

Correct answer: Before entering the curve

Always reduce speed before entering a curve; hard braking after entry could cause the tires to lose traction.

Source: Speed Management & Stopping Distance

Correct answer: Slow down in rain or on wet roads

Hydroplaning happens when tires ride up on water; the best way to avoid it is to slow down in rain or when water is pooled.

Source: Speed Management & Stopping Distance

Correct answer: About 158 feet

Braking distance at 50 mph on dry pavement with good brakes can be about 158 feet, plus perception and reaction distance.

Source: Speed Management & Stopping Distance

Correct answer: ¾ second to 1 second

The average driver has a reaction time of ¾ second to 1 second, and a similar perception time.

Source: Speed Management & Stopping Distance

Correct answer: Traffic bunches up; you can be ticketed for impeding

Going much slower than others makes traffic bunch up and causes passing; you can be ticketed for impeding traffic.

Source: Changing Lanes & Adjusting to Traffic

Correct answer: Drive well below them; they assume dry summer roads

Go slowly; posted limits are intended for summer months on dry pavement. Never use cruise control on slippery roads.

Source: Winter Driving Safety Tips

Correct answer: On slippery roads

Never use cruise control on slippery roads.

Source: Winter Driving Safety Tips

Correct answer: Reduce speed and increase following distance

Traction is reduced on gravel or dirt; reduce your speed, increase following distance, and expect that you may skid when stopping.

Source: Rural Road Driving

Correct answer: 20 to 30 seconds ahead

Ideally, look at what is occurring 20 to 30 seconds in front of the car.

Source: Safe Driving Tips – Visual Search

Correct answer: Check your speedometer often

People are not good at judging how fast they are going; check the speedometer often, especially after leaving high-speed roads.

Source: Basic Driving – Steering, Hand Position & Backing