California Car / Permit practice question · Safe Driving Practices

During a heavy rainstorm or snowstorm, your visibility drops to no more than 100 feet ahead. What is the fastest speed still considered safe?

Answer choices

• 30 mph— Correct answer
• 45 mph
• 55 mph
• There is no specific limit as long as you use wipers

Why this is the answer

In a heavy storm of rain or snow, your view may shrink to 100 feet. With a view that short, going above 30 mph is unsafe, so slow down to that speed or less. Speeds like 45 or 55 mph are too fast, and using wipers alone does not remove that limit.

Source: California Driver Handbook — Driving in Bad Weather

Content reviewed against official driver handbooks · August 12, 2026