Reserved movement right by specified vehicle class
Only vehicles on the primary sign can proceed in the indicated direction.
Where you will see it
At a junction where the right turn is held for one class of vehicle, with that class shown on the sign above.
What to do
Take the right turn only if you are driving the class named. Doing so, move as far right as the markings allow and wait for a gap, since you must not turn right in front of oncoming traffic.