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You are driving a vehicle that can be driven safely at 55 mph on an open road. Although the speed limit is 55 mph, traffic is heavy, moving at 35 mph. The safest speed for your vehicle in this situation is

A 35 mph.
It's usually safest to drive at the speed of traffic rather than constantly pass other vehicles or invite other drivers to pass you. However, if there are lower speed limits posted for CMVs, obey them.
B 45 mph.
C 40 mph.