CONING AND SIGNING
O7.2.43 Traffic cones used within ETM shall comply with either diagram 7101.1 or 7102. The number of cones used is unlikely to comply with the requirements of Part 1: Design, hence the size of cone used should always be the largest size of cone available at time of deployment. Under no circumstances shall the size of cone be less than 450 mm in height.
O7.2.44 Cone spacing shall not be greater than 12.5 m in the final ETM layout. Coning at 12.5 m centres shall be continued longitudinally past the incident if resources allow.
O7.2.45 ETM shall always be deployed across full lane widths only.
O7.2.46 If the incident is on a dual carriageway between two live lanes of traffic, coning shall always be from either the near side or off side of the carriageway as appropriate, in order to avoid the formation of an island.
O7.2.47 The lead-in taper on a dual carriageway road with a permanent speed limit of 40 mph or above shall be not less than 100m in length per lane closed. Below 40 mph. the lead-in taper may be reduced to 50 m minimum. Longer taper lengths may be necessary if sight lines (horizontal and vertical) are restricted. See Figure 7.2. Details of the lengths of tapers for single carriageways are given in Table 5.3 in Part 1: Design, Section D5.4, and depend on the permanent speed limit and the width of the hazard. The required taper length is between 13 m and 125 m.
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Figure 7.2 Minimum ETM coning and signing (40 mph and above)
NOTES:
- For appropriate fend position see paragraphs O7.2.76 to O7.2.78.
- For details of signing refer to paragraph O7.2.55.
O7.2.48 If the duration of the closure is to be protracted, or its position dictates a longer taper, additional support shall be called upon to implement a more permanent closure complying with the guidance provided in Part 1: Design.
7.2.49 The working space in advance of the incident shall be determined according to the nature of the incident being dealt with. Where emergency services or traffic officers need to utilise the area in advance of the incident, a working space shall be incorporated into the ETM layout (in addition to the 50 m already provided). Emergency services and/or recovery operators should always work under the protection of ETM within the working space provided.
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