From Saskia Latendresse
I was impressed with the possibility of letting complex systems like traffic lights self-organise (9 August, p 28). But this ignores something that urban planners in North America are also guilty of, which is dealing with road traffic and pedestrians separately, even though intersections are shared by all.Any rules for self-organising lights should allow for pedestrians crossing. All too often, pedestrians are stuck at intersections with 10 seconds to cross eight lanes, or they have to wait so long for the crossing signal that they give up and cross anyway.
Montreal, Canada
