I think what you are asking is in the city there are several ways to get in an accident in bike/auto traffic. And that there are more of these incidents or conditions than suburb or rural areas. Is that correct?

Then there are the choices between platform pedals and clip (cage) and clipless (non-cage). So I think what you are saying is that the platform pedals allow a rider to get in and out of the pedal quicker than the other two. Therfore its safer somehow.

But what we are missing is very important. The types of "accidents" and its relation to the pedal type. The most common would be falling off the bike at a stand still while being clipped in. But I don't think that's what you're asking, right?