Table 1 Overview of modelled incident scenarios and techniques

S1: Collision

1.1 Close all 3 lanes

1.2 Incident screen

1.3 Close 2 of 3 lanes

1.4 Tow in off-peak

S2: Weather event

2.1 Close both 2 lanes

2.2 Contraflow

2.3 VMS + Speed limit

S3: LGV breakdown

3.1 Close 1 lane of 3

3.2 Repair on-site

3.3 Tow in off-peak

(closing 2 lanes)

S4: Obstruction

4.1 Close both 2 lanes

4.2 Contraflow

4.3 Close blocked lane