Selecting this scenario starts me at 7:30 in the morning in blazing summer conditions. Full sun. The on-screen text says "don't let the mist fool you" or something like that, but there is no mist at all... I know some of the surprises of this scenario already, but is the mist supposed to come in at a later point along the route, or are you supposed to start with it?
Whelp. I know what went wrong. I slipped past the stop marker at the first 'red signal' so I got the new 'objective failed' mechanic. This breaks the scenario because now there is no mist.