Almost the entire grid road network was designed with reservations to enable future dualling as traffic levels rose. However, the last section of the original system to be dualled in full was the H8 at Snelshall West, dualled in 2001. Since then, traffic levels have continued to grow, but dualling has not continued, resulting in several sections of heavily congested single carriageway.
City of Future has identified the most urgently needed sections for dualling. The map below shows the current extent of dual carriageway grid roads, with City of the Future’s proposed high-priority duallings shown in fainter colour:
All our proposed duallings would include conversion of affected estate road junctions into left-in/left-out only junctions (with possible emergency/bus crossing points). Our priorities for dualling are:
H5, V4-A5
H7, V11-Countess Way
H10, V7-A5
V6, H2-H3 and H9-H10
V7, H3-H4 and H7-H10*
V10, H3-H4
V11, H5-H6
*The dualling of the H7-H9 section of V7 would include central reservation barriers to prevent unauthorized pedestrian crossings, enabling the removal of the 40mph speed limit.
The following sections of the grid system were not designed with dualling reserves, but mostly still possess sufficient space for widening with a narrow central reservation:
V4 entirety
V6, H9-H10
V9, H3-H5
V10, Wolverton Road-H3
H1 west of A5
H2, McConnell Drive-V6
City of the Future 