Large road vehicle (5)
(Other definitions for bus that I've seen before include "Of projectiles; (go) mad (slang)" , "Charabanc" , "Large passenger vehicle - small business!" , "eg Double-decker" , "Mode of public transport" .)
(Other definitions for lorry that I've seen before include "Heavy goods vehicle" , "Large motor vehicle for transporting goods" , "Industrial vehicle" , "Transport vehicle" , "Commercial vehicle" .)