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Sliding gate controlling the rate at which chippings leave the spreader hopper. Adjusted to keep surface dressing uniform across the carriageway width.

Metal or composite guard positioned over the sweeper’s engine-air intake. Stops rainwater entering the filter housing during wash-downs or heavy weather.

Particle size distribution curve used for chip selection.

Measuring chip moisture to anticipate binder absorption.

Electronic probe inserted into stored chippings to measure residual moisture. Guides the operator in adjusting binder rate for surface dressing accuracy.

Applying bitumen film to chippings before spreading to improve adhesion in surface dressing.

Kilograms per square metre of chippings applied over the sprayed binder.

Digital probe that records the temperature of coated chippings before spreading. UK surface dressing specifications require readings within a defined range for adhesion.

Portable logger clipped to the aggregate conveyor. Records chipping temperature to confirm compliance with Clause 922 surface-dressing specs.

Directs high‑velocity air from the sweeper fan to dislodge curbside debris.