M42 Active Traffic Management Pilot Project - Results

The Active Traffic Management (ATM) project on the M42 near the City of Birmingham city is an important and high profile pilot scheme for the Highways Agency (HA) in England. It established a new method for the dynamic use of the hard shoulder between J3A and J7 together with variable mandatory speed limits during periods of peak demand (4L-VMSL). The performance of 4L-VMSL has been assessed against two base cases: three lane variable mandatory speed limits (3L-VMSL) and the situation before the implementation of ATM (NO-VSL). Based on data covering the first 12 months of operation the analysis has shown that: 4L-VMSL increases the observed maximum throughput of the motorway by an average of 7% (compared to NO-VSL) and 9% (compared to 3L-VMSL). 4L-VMSL reduces the average journey time during periods of recurrent congestion. 4L-VMSL significantly reduces the variability of journey times. On average over all weekdays the variability of journey times during 4L-VMSL has been reduced by 22% and 32% when compared to NO-VSL and 3L-VMSL respectively. This paper presents the main results that have been obtained from the detailed analysis and identifies the lessons learnt from the evaluation of ATM.


  • English

Media Info

  • Media Type: CD-ROM
  • Features: Figures; Maps; References; Tables;
  • Pagination: 12p
  • Monograph Title: ITS Connections: Saving Time. Saving Lives

Subject/Index Terms

Filing Info

  • Accession Number: 01144639
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Nov 10 2009 10:44AM