ATKINS&JACOBS：2020年智慧高速公路事故和基础设施调查——应急车道紧急宽度审查报告（英文版）

Since the completion of the M42 Active Traffic Management (ATM) pilot in 2006, Smart Motorway standards have been through a number of iterations but the prescribed width for an emergency area in all published versions of Interim Advice Notes (IAN)1 has been 4.6m (15 foot). However, where constraints existed (for example limited available space) IAN 111/08, IAN 161/12 and IAN 161/13 permitted a relaxation to reduce the width to 4.0m (13 foot). The publication of IAN 161/15 removed this re