Vehicle with spray means

A motorized vehicle for effecting a spraying operation onto an elongate structure as the vehicle travels alongside said structure, the vehicle comprising an arm extendable transversely of the vehicle and provided with spray means for effecting said spraying operation associated with means for following the elongate structure, a tank for holding a medium to be sprayed by the spray means, and means for supplying said medium under pressure to the spray means, said spray means being mounted on the arm by a trailing linkage movable between control position limits relative to the end of the arm, and said linkage being adapted to control extension or retraction of the arm when said position limits are reached.