Actually, suburban streets are significantly more dangerous than urban streets, in terms of number of children killed, as a fraction of both population and miles driven.
> Motor vehicle traffic was the leading mechanism of unintentional injury death among children aged 5–13, with the rural rate (3.1) twice as high as the urban rate (1.5)
> Motor vehicle traffic was the leading mechanism of unintentional injury death among children aged 14–17 in both urban and rural areas; the rate was 2.5 times higher in rural (12.5) than in urban areas
https://www.cdc.gov/nchs/products/databriefs/db421.htm
> cul-de-sac communities actually have some of the highest rates of traffic accidents involving young children. In fact, children in suburban communities are five times more likely to be killed in a pedestrian accident than urban children.
https://www.lewisandtompkins.com/motor-vehicle-and-public-tr...
> City streets safer than suburban roads, study finds
https://whyy.org/articles/study-city-driving-often-safer-tha...
> Cul-de-Sacs Are Killing Us: Public Safety Lessons From Suburbia
https://usa.streetsblog.org/2011/06/07/cul-de-sacs-are-killi...