The helmetless debate ensues, this time in the NYTimes. 
Where should we come down on this matter? Here is what I want to know:
(1) Where helmetless behavior reigns strong, what is the average speed of the cyclist?
(2) Where helmetless behavior reigns strong, what is the average speed of the auto?
Nothing ever talks about these matters. I imagine both are substantially slower than in most US settings. Here’s a proposition: bring down the speeds of both and helmetless behavior might not be such a big deal.
