People here in Tokyo follow at obscenely tight distance on the freeways and motorways. Drives me crazy. Don't have the data, but having driven here for over 20 years, I’d venture that short following distances must be one of the main causes of accidents on these types of roads. People are otherwise generally cautious and attentive drivers. When I’ve expressed frustration about it to locals in the past, the response is often “but if you leave more space, people will cut in!” To which I respond, “okay, and?!” I feel like a single big media campaign to improve following distances could result in a big improvement. So frustrating.