Supplementary Stage 1 Road Safety Audit Designer's Response

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M1 Junction 19 Improvement Stage 1 Road Safety Audit Designer’s Response / Exceptions Report Problem 10 - Spacing of signs on gantry Junction of M6 – A14 and M1 Southbound Problem At the nosing of the M1 Southbound diverge from the M6 – A14, gantry sign RC1 is provided. The sign faces do not appear to span the lanes correctly and could lead to driver confusion and unsafe lane movements. Recommendation Ensure RC1 spans lanes correctly. Designer’s Response At the next stage of design development, the traffic signs and road marking design will be reviewed to ensure that sign face RC1 correctly spans lanes. Exception No exception required. Problem 11 - Location of sign MIS3A M1 – M6 Northbound Link Problem This sign indicates two additional lanes of traffic joining from the right. At its location there is hatching and a merging lane to the right before the two mainline traffic lanes. This could cause driver confusion. Recommendation Move MIS3A further down the slip road or replace with another MIS3. Designer’s Response At the next stage of design development, the traffic signs and road marking design will be reviewed to consider moving traffic sign MIS3A down the slip road or replacing it with another MIS3 traffic sign. Exception No exception required. Rev.:1 12 Issued: February 2010
M1 Junction 19 Improvement Stage 1 Road Safety Audit Designer’s Response / Exceptions Report Problem 12 - Speed enforcement on these links Entry to M6 – M1 Southbound Link, M1 – M6 Northbound Link, M1 – A14 Eastbound Link and A14 – M1 Northbound Link Problem These links have a design speed of 85kph and as such drivers entering onto these links must be made aware of the reduced speed limit and enforcement may be necessary. Recommendation Provide speed limit signs on entry to all of these links and provide details of how the speed limit will be enforced. Designer’s Response The four interchange links proposed as part of the Preferred Route and presented on the drawings reviewed by the Road Safety Audit team have been designed in accordance with the requirements of TD22/06 Layout of Grade Separated Junctions. The design speed of 85kph is in accordance with the requirements of Table 4/1 of TD22 for an interchange link between rural mainlines with a design speed of 120kph. A minimum stopping sight distance (SSD) of 160m is proposed between the back of diverge layout nose and the back of the merge layout nose. Full mainline SSD of 295m is proposed over the full length of the merge and diverge layouts in accordance with the requirements of TD 9 (Highway Link Design) and TD 22. However, should the issue continue to be raised in subsequent Road Safety Audits consideration could be given to the provision of an advisory 50mph or 60mph speed limit and additional traffic signs. Exception The Designer requests an exception as provision of speed limits on these four interchange links is not considered necessary and would not be in keeping with current practise at other similar locations on the motorway and trunk road network. Rev.:1 13 Issued: February 2010
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Supplementary Stage 1 Road Safety Audit Designer's Response

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