576
Front Brake Lights Could Drastically Diminish Road Accident Rates
(bioengineer.org)
This is a most excellent place for technology news and articles.
Definitely make it easier for people on crosswalks to start walking. Knowing that they are slowing down.
In order to be most effective it would need to be dynamic rather than a fixed on/off like rear brake lights. Stopping doesn't mean stopped. So perhaps a progressive light bar that starts lighting up at 20mph and adds a light for each 5mph drop until the whole bar is lit indicating a full stop. That would give pedestrians a sense of rate of deceleration.