New Puzzler 1/24/97: Traffic In Sweden

Ray: This was sent to us by John Pitts via cartalk.com. In Sweden, on a weekday in 1965 at 5 PM all traffic in the whole country stopped. A few moments last it started up again and has never been the same since. What happened at 5 PM and why did it happen on a weekday?

[ Car Talk Puzzler ]