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You are driving a 100 foot twin trailer combination at 50 mph. the road is dry and the visibility is good. you should keep at least ____ seconds of space ahead of you.

A 11
Explaination
The rule says you need at least one second for each 10 feet of vehicle length at speeds below 40 mph. At greater speeds, you must add 1 second for safety. For a 100 foot twin trailer trailer combination traveling at 50 mph, you need at least 11 seconds of space ahead of you.
B 9
C 10
D 12