California Driver License (DMV) Written Practice Test

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Ace your California DMV written test! Prepare for the exam by practicing hundreds of multiple-choice questions covering traffic laws and road signs. Boost your knowledge, gain confidence, and increase your chances of passing the test on your first try.

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

Practice this question and more.

What are the four components of a DUI investigation?

None
At least one car length
The distance of one block
The length of two cars

The correct answer is: At least one car length

When merging onto a freeway, you should give at least one car length of space between your vehicle and the vehicles already on the freeway. This allows for a safe merging maneuver and gives enough room for both vehicles to adjust their speed if needed. Option A, none, is incorrect because merging onto a freeway without giving enough space can cause an accident or force other drivers to suddenly change lanes. Option C, the distance of one block, is incorrect because this distance can vary greatly depending on the length of a block and may not be a safe distance for merging. Option D, the length of two cars, is also incorrect as this may not leave enough space for a seamless merge and can create a potential hazard on the freeway.