Smart Motorway All Lane Running M25 J23-27 Monitoring Third Year Report

This document describes an evaluation of the Smart Motorway All Lane Running (SMALR) scheme on the M25 between junctions 23 and 27, aimed at improving traffic flow and safety by converting the hard shoulder into an additional lane. The evaluation used data on collision rates, journey times, and compliance with lane closures to assess the scheme's impact. Results showed a 16% increase in traffic flow, particularly on weekends, with slight improvements in anticlockwise journey times and unchanged clockwise times. Safety goals were achieved with no rise in serious casualties, and high compliance with Red X lane closures was observed at 94%. The evaluation concludes that the SMALR scheme has successfully enhanced capacity and maintained safety and journey times. Additional analysis of contributory factors to accidents identified driver error and distraction as significant causes, and while journey times decreased overall, some challenges with Red X compliance were noted. **This summary was written by an AI model and therefore should not be considered a definitive summary of the report. If you are aware of inaccuracies, please email evaluation.registry@cabinetoffice.gov.uk.**

Description

• Lead department: Highways England
• Evaluation stage: A complete evaluation report
• Other departments: No other departments listed
• Evaluation types: Impact evaluation
• Impact methods: Quasi-experimental method
• Quasi-experimental methods: Interrupted time series analysis
• Grant information: This intervention is not distributing funding via a grant
• Government Major Project information: This intervention is not a major project
• Policies: No policies provided

Event Dates

• Event Name: Publication of final results
• Event date: July 2018

Evaluation Costs

• Cost: Not provided

Evaluation sharing

• Link(s) to published report(s): Yes
• Links to evaluation plans: No link provided
• Findings: Not provided
• Permission to share confirmed: Yes