At 20 mph, a pedestrian has a 95% chance of survival if struck. 20 is plenty on residential streets.

20 is Plenty.

At 20 mph, a pedestrian has a 95% chance of survival if struck.

At 40mph, the chance of survival is reduced to 20%.

As speed increases, your cone of vision narrows.

20 is plenty on residential streets.

20 is plenty when passing pedestrians.

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Remember - pedestrians are to walk against traffic (not with traffic).  It's the law.