Walking classes also need road space reallocation

EDITOR—We welcome Roberts's editorial, making the health case for the London congestion charge,1 particularly as the revenue is required to be spent on transport. We agree that physically active transport such as walking and cycling is likely to increase. This must be monitored adequately, with attention given to changes in activity levels2 and broken down by sociodemographic groups, to assess the impacts on health and inequalities.

Other potential effects of congestion charging include improvement in access for emergency vehicles. However, not all are positive: the impact of the policy will depend on which complementary measures are introduced at the same time.

Firstly, we disagree that less car travel will result in fewer crashes; this impact is difficult to …