Traffic Assessment - Renfrewshire Council

Table 4.5 A8 Greenock Road / Station Road
ARM Base Base plus Development
Max RFC Max Q Max RFC Max Q
B - A 0.65 2 1.13 25
B - C 0.71 2 1.10 11
C - AB 0.52 1 0.80 5
A: Greenock Road East; B: Station Road; C: Greenock Road West
4.28 Station Road has been modelled with a short flare and the results indicate this arm will operate well
over capacity with a maximum RFC of 1.13 and significant queuing on the approach to Greenock
Road. Notwithstanding the RFC, as a result the on-street parking on Station Road, some 60m from
Greenock Road, which reduces the carriageway width to one lane, this level of queuing could very
quickly block all traffic movement on Station Road and potentially result in vehicles queuing back
onto Greenock Road.
4.29 It is acknowledged that, even with a route available from the north access road, the household
distribution throughout Bishopton means it is highly unlikely a sufficient proportion of local trips
would use this alternative route to provide adequate relief to Station Road.
4.30 Therefore, based on the existing and consented road network infrastructure, improvements to the
A8 Greenock Road / Station Road junction are required to mitigate the traffic impact associated
with the 6,000m 2 foodstore.
A8 Greenock Road / Station Road Mitigation Analysis
4.31 The access for the adjacent commercial property presents a challenge when identifying an
appropriate junction format to mitigate the proposed development’s impact. While we have
considered the use of traffic signals, the proximity of the commercial property’s building and the
constrained road space from the edge of Greenock Road to this building means it is difficult to
accommodate the traffic signal equipment necessary to incorporate the access into the junction
design.
4.32 As a result of constraints imposed by the geometry of the junction and the adjacent land uses, JMP
would consider the most appropriate junction format would be a mini-roundabout. A preliminary
layout, in accordance with the Design Manual for Roads & Bridges, is indicated by JMP Drawing
SCT3526/SR/001 provided in Appendix H. While the access to the commercial property has been
incorporated into the preliminary design, the low level means we have assessed it as a 3-arm
roundabout only.
4.33 The results of the ARCADY analysis for the weekday PM peak period are indicated by Table 4.6
below.
Table 4.6 A8 Greenock Road / Station Road Mini-roundabout
ARM Base plus Development
Max RFC Max Q Ave RFC Ave Q
A – Greenock Road (east) 0.70 2 0.63 2
B – Station Road 0.90 7 0.78 4
C – Greenock Road (west) 0.50 1 0.44 1
Page Job No Report No Issue no Report Name
22 SCT3526 1 1 Dargavel Village
Proposed Village Core Development