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A ramp's posted speed limit

A Is suitable for some vehicles, but may be too fast for a large CMV
Explaination
Posted speed limits on exit and entrance ramps often show speeds that are safe to be driven by cars. However, these speed limits may be too fast for large or heavily-loaded vehicles and CMV drivers will likely need to slow down to a speed below the posted limit.
B Is suitable for all vehicles
C Is just a suggestion and may be exceeded