[wybo]

By being red at least 50% of the time (and making cars drive past fast & and making it an offence to cross the street even if there is no traffic (so in addition to watching the traffic one needs to scan the street for police...)).

Also, in many older (& also modern Dutch & UK inner cities) we have a thing called Woonerf (http://en.wikipedia.org/wiki/Woonerf), which means a ~15 miles per hour maximum speed off the main roads inside residential areas, so pedestrians and kids can actually enjoy/play on the roads...