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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

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