Definition: A large motor vehicle carrying passengers by road, especially one serving the public on a fixed route and for a fare.
This lexicalized sign is also very commonly used.
Gloss: BUS/\ CL-bus TRUCK/\ DRIVE CL:3-REVERSED-INTO-BUS.
English equivalent: The truck reversed into the back of a bus.
The signer uses the passive "C" handshape (which is a classifier for the bus) while using the dominant "3" classifier for the truck.
Raise eyebrows (topicalization) for the bus and again for the truck.