Can any vehicle travel on this roadway?
A)No, because it is an exclusive road for motor vehicles.
B)Yes, except two-wheeled motorcycles without a sidecar.
C)Yes.Correct
The sign in the question does not prohibit any type of vehicle from travelling on the roadway, but it does require drivers of motor vehicles, except motorcycles without a sidecar, to use it. That is, motorcycles without a sidecar may travel on the roadway but are not required to do so.