The binder course mixture must be HRA 60/20 F bin 40/60 des with the wheel tracking requirements meeting classification 2 for road Type 0, and classification 1 or 2 for road Type 1. For road Type 1, classification 2 should be selected for heavily stressed areas such as bus lanes, roundabouts, and approaches to pedestrian crossing or traffic lights.
The preferred binder course mixtures are HRA 50/20 F bin 100/150 or, HRA 50/20 F bin 70/100 or HRA 50/20 F bin 40/60.
Alternative permitted mixtures (a) and (b) below may be used by agreement where satisfactory local experience has been gained in their use.
Openings up to 500 mm width – HRA 50/14 F bin 100/150 or, HRA 50/14 F bin 70/100 or HRA 50/14 F bin 40/60.
Openings over 500 mm width – HRA 60/20 F bin 100/150 or, HRA 60/20 F bin 70/100 or HRA 60/20 F bin 40/60.
Areas that exhibit signs of regular trafficking by commercial vehicles or such sites notified to the undertaker by the authority must be reinstated in accordance with S8.7. In such situations the preferred binder course mixture must not be replaced by any carriageway surface course mixture and 100/150 pen material must not be used.
In areas not subject to vehicular trafficking, the preferred binder course mixture may also be replaced by any permitted carriageway surface course mixture.