Comment
Draft Local Plan
Representation ID: 15872
Received: 11/05/2016
Respondent: National Highways
An assessment of the operation of the SRN junctions has not been undertaken within the Highway Modelling Report. Therefore it is not possible for AECOM to speculate on the potential operation of these junctions following Local Plan development.
Junction 17 (A1023 / Mascalls Lane / Spital Lane) and Junction 19/20 (A127 / B186) are located close to M25 Junctions 28 and 29 respectively and AECOM consider that any queuing back from
these junctions towards the motorway could compromise the effective operation of these junctions. AECOM have primarily considered the operation of the junctions for Option 1, as this is the preferred option that has been taken forward for implementation in the LP.
At Junction 17 the A1023 approach to the junction (the approach of concern to HE) is predicted to operate over capacity in the AM peak, with Mean Max Queues (MMQ) expected to reach approximately 300m back from the junction. Whilst M25 Junction 28 is approximately 500m away, as the approach is over capacity it is likely that the full extent of the queue will be approximately 600m at the end of the peak hour. This could reach back to, and through, M25 Junction 28 and could therefore affect the operation of the junction and the M25 offslips.
At Junction 19 the A127 Eastbound offslip is predicted to operate significantly over-capacity in the AM peak, with queues predicted to reach approximately 1km, which could stretch back to M25 Junction 29.
See attached