Time Travel (Probably) Movie

[Ed Sigma]

I've had a memory echoing around in my head from something I saw on the TV when I was about six, where the first scene featured a guy (the main character) saying goodbye to his wife and son as they drive off school, only to see them die in a firey car crash about a minute later.  The rest is kind of a blur, but the end is a replay of that scene except this time the guy suddenly realises what will happen and stops and saves them.  Any ideas?

[Menard]

That movie is Timestalkers which starred William Devane, Lauren Hutton, and Klaus Kinski.