Abstract: A self-propelled sweeper vehicle (10) has front steerable wheels (16) mounted on a centrally pivoted axle assembly (28) which also carries the nozzle (30) and brush gear (24) whereby these assemblies are steered in unison with the vehicle. The nozzle front edge (106) is convex and promotes non-turbulent air intake. The nozzle is formed as a hollow rotationally moulded structure of a plastics material having inherent structural strength and stiffness. The brush gear (24) is mounted on linkages comprising inner and outer portions (200, 202) pivotally connected for folding movement to resiliently yield under impact. The brush covers (260) are formed as hollow plastics mouldings and part of the brush support structure.