A motorist is driving along a commercial boulevard where the posted maximum speed limit is… — DMV Permit Practice Test

A motorist is driving along a commercial boulevard where the posted maximum speed limit is $40\text{ mph}$ . Heavy rainfall has created areas of standing water on the pavement and severely restricted visibility, causing surrounding traffic to slow down to $20\text{ mph}$ . Under standard speed regulation laws, which of the following actions is the motorist legally required to take?

Reduce vehicle speed to $20\text{ mph}$ or lower to match road conditions, regardless of the posted $40\text{ mph}$ limit.Answer
B
Maintain $40\text{ mph}$ because posted speed signs set the minimum legal speed threshold for normal traffic flow.
C
Continue driving at $40\text{ mph}$ provided emergency hazard warning lights are activated.
D
Accelerate slightly to clear the flooded roadway quickly before hydroplaning occurs.

Answer

The driver must reduce speed to a safe rate suited to current visibility and road surface conditions, regardless of the posted maximum limit.

Under the Basic Speed Law, drivers must adjust their speed downward during hazardous conditions such as heavy rain, standing water, or poor visibility. The posted maximum speed limit of

40\text{ mph}

applies only under ideal conditions. Therefore, reducing speed to match current traffic and safety conditions is legally required.

Step-by-Step Solution

Identify the applicable speed rule for adverse driving conditions.

Recognize that the Basic Speed Law applies whenever weather, traffic, or road conditions are non-ideal.

Posted speed limits indicate the absolute maximum speed permitted only during optimal, clear conditions.

Evaluate the current road scenario.

Heavy rain, standing water, and reduced visibility demand a speed lower than the posted maximum limit of

40\text{ mph}

Safe vehicle stopping distance and traction are compromised by rain and standing water.

Determine the required legal action.

Slow down to a safe and reasonable speed, such as

20\text{ mph}

or lower, to maintain vehicle control and safe distance.

Driving faster than conditions safely permit violates speed regulation laws even if below the posted maximum.

Key Concept

Basic Speed Law

Estimated Time:1m 0s

Question

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Step-by-Step Solution

Key Concept

Common Mistakes

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