but more important the results are is shown on this table and the cities were london new york bristol england and austria and portland oregon and this table highlights the approach they used a combination of slow zones and traffic calming devices and speed limit reductions for example in bristol england they simply lowered the speed limit but didn't increase enforcement or put in traffic calming devices of . other cities combined it with traffic calming measures or slow zones and again these are the different approaches of all of the cities we looked at the london experience has been the most interesting because it's the most extensive there's more than 400 areas in greater london that have slow zones established on the residential streets and no higher than 30 on some some of the main streets. in terms of results, they are is shown here again because the london efforts have been so extensive they have also done the most exhaustive research so of the studies we looked at that was probably the most interesting it covered 385 of the 400 zones and excuse me -- here we go. and found that they had

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