Iowa Permit Test: Speed Limits Practice Questions

Correct answer: 20 mph

Without posted limits: 20 mph in business districts, 25 mph in residential or school districts, 45 mph in suburban districts.

Source: Chapter 4: Basic Driving Skills – 4.5 Appropriate Speed

Correct answer: 25 mph

The general limit is 25 mph in a residential or school district.

Source: Chapter 4: Basic Driving Skills – 4.5 Appropriate Speed

Correct answer: 45 mph

The general limit in any suburban district is 45 mph.

Source: Chapter 4: Basic Driving Skills – 4.5 Appropriate Speed

Correct answer: 45 mph

Without a posted limit, any vehicle pulling another vehicle is limited to 45 mph.

Source: Chapter 4: Basic Driving Skills – 4.5 Appropriate Speed

Correct answer: 70 mph

Rural interstate highways have a 70 mph limit; primary roads and urban interstates are 60 mph.

Source: Chapter 4: Basic Driving Skills – 4.5 Appropriate Speed

Correct answer: 60 mph

60 mph applies on primary roads, urban interstates and secondary roads (including unpaved) from sunrise to sunset.

Source: Chapter 4: Basic Driving Skills – 4.5 Appropriate Speed

Correct answer: 50 mph

Unsurfaced secondary roads are limited to 50 mph from sunset until sunrise (and for trucks on secondary roads at any time).

Source: Chapter 4: Basic Driving Skills – 4.5 Appropriate Speed

Correct answer: 40 mph

The interstate minimum is 40 mph; vehicles that can't go at least that fast under normal conditions aren't allowed.

Source: Chapter 4: Basic Driving Skills – 4.5 Appropriate Speed

Correct answer: About 3 times farther

A vehicle at 60 mph travels about 3 times farther than one at 30 mph before coming to a stop.

Source: Chapter 4: Basic Driving Skills – 4.5 Appropriate Speed

Correct answer: The maximum for ideal conditions

The posted limit is the maximum you can legally drive under ideal conditions; slow down for road and weather conditions.

Source: Chapter 4: Basic Driving Skills – 4.5 Appropriate Speed

Correct answer: 25–35 mph

Snowplows typically operate at 25–35 mph, and many drivers hit them from behind.

Source: Chapter 5: Applying Your Driving Skills – 5.13 Inclement Weather Driving