From personal experience, motorcycles are allowed to as they are motorized vehicles. In practice, the stupid magnetic sensors are often so detuned that they don’t pick up the motorcycle entering the field so the system doesn’t react to tell the order taker someone is there. Motorcyclists can sometimes adjust for this by mounting a special magnet to the bottom of their machines to increase the magnetic signature of the vehicle.
Amusingly, ones so detuned that they won’t pick up a motorcycle also sometimes have problems with big 4x4 trucks as the low-level magnetic field doesn’t extend high enough to actually be affected by the giant steel axle.
lol