You're driving 55 mph and the road is wet from steady rain. What does the manual say to do with the 4-second following interval it lists for good road conditions?
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A.
Slow down and increase the following distance beyond four seconds. Correct
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B.
Switch to one car length for every 10 mph of speed.
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C.
Keep the 4-second gap; it's the manual's minimum for speeds above 30 mph.
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D.
Drop back to a 2-second gap so a hydroplaning car can clear it faster.
The answer is "Slow down and increase the following distance beyond four seconds."
For speeds above 30 mph, the manual's 4-second gap is only the good-conditions baseline; once the pavement is wet it says plainly to slow down and increase the following distance, meaning more time than four seconds. Option C comes from reading that 4-second figure as an all-weather minimum that already accounts for rain, so no adjustment gets added once the road is wet.
The traps in the wrong answers
B. Switch to one car length for every 10 mph of speed.
The manual measures the following gap in seconds, not car lengths, and asks for more time as conditions worsen. Reaches for the older 'one car length per 10 mph' rule of thumb learned before the manual switched to a seconds-based interval.
C. Keep the 4-second gap; it's the manual's minimum for speeds above 30 mph.
The 4-second gap is only the good-conditions baseline. When the road turns wet the manual tells you to slow down and increase the following distance, meaning more time than four seconds. Treats the 4-second good-conditions baseline as a single all-weather rule, so no adjustment is added when the road turns wet.
D. Drop back to a 2-second gap so a hydroplaning car can clear it faster.
Poor conditions call for more time, not less. The 2-second interval in the manual applies only at 30 mph or less in good road conditions, not to wet pavement at 55 mph. It appeals to a driver who recalls the two-second rule as the only following-distance number worth memorising.
This question tests your knowledge of Adverse Conditions in Texas. Source: Texas Driver Manual, "Chapter 8: Speed and Speed Limits (Speed)," p.45..
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