Time saving benefits from the M25 smart motorway schemes

The topic of David Metz’s article in the last issue is an important one (‘Time savings benefits of M25 upgrade ‘eaten up by growth’’ LTT 16 Apr). So important that it deserves a critical review and a few additional comments.

In practice scheme benefits are calculated by comparing the with-project travel demands and journey times against the without-project case. Benefits are not calculated by a comparison against the base year, so it’s not relevant if the...

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