Supplementary Stage 1 Road Safety Audit Designer's Response
Supplementary Stage 1 Road Safety Audit Designer's Response
Supplementary Stage 1 Road Safety Audit Designer's Response
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M1 Junction 19 Improvement<br />
<strong>Stage</strong> 1 <strong>Road</strong> <strong>Safety</strong> <strong>Audit</strong> Designer’s <strong>Response</strong> /<br />
Exceptions Report<br />
2.4 ROAD SIGNS, CARRIAGEWAY MARKING AND LIGHTING<br />
Problem 9 - Change of road layout, provision of signage and link capacity<br />
M6 Eastbound approach to junction with M1 and A14<br />
Problem<br />
The current junction layout is such that<br />
vehicles wishing to use M1 Southbound<br />
use the two right hand lanes. The new<br />
layout is the opposite where vehicles<br />
wishing to use M1 Southbound use the left<br />
hand lanes. The proposed gantry signage<br />
ADS1, ADS2, and ADS3 indicates that to<br />
use M1 Southbound the left hand lane<br />
must be used. This does not match TT1<br />
and TT2 which show that the M1<br />
Southbound can be reached from the<br />
middle lane as well. Given that the current<br />
provision for this movement is that two<br />
dedicated lanes becoming three on the M6<br />
– M1 Southbound Link, the auditor is<br />
concerned that there may be a capacity<br />
issue with the current layout which is one<br />
dedicated lane and a shared lane on the<br />
M6 becoming two on the M6 – M1<br />
Southbound Link.<br />
Recommendation<br />
For this change in layout to work without<br />
excessive late lane changes, the road<br />
markings and signage must be easily<br />
understood. Ensure that signage clearly<br />
indicates that M1 Southbound can be<br />
reached from the middle lane and provide<br />
lane destination markings on the road<br />
surface. An assessment of junction<br />
capacity will also be necessary.<br />
Designer’s <strong>Response</strong><br />
The proposed Type D (Option 1) Ghost Island diverge for Lane Drop with three lanes<br />
upstream of the diverge, two lanes on the connector road and two lanes downstream of<br />
the diverge has been included in the design following a review of the forecast traffic<br />
flows for both the opening year (2014) and the design year (2029) to meet the<br />
requirements of TD22/06 Layout of Grade Separated Junctions.<br />
At the next stage of design development, the traffic signs and road marking design will<br />
be reviewed to ensure that signage clearly indicates that M1 southbound can be reached<br />
from the middle lane and provide lane destination markings on the road surface.<br />
Exception<br />
No exception required.<br />
Rev.:1<br />
11 Issued: February 2010