In the cold and in the snow, the "engine" dosen't get as hot, but anti-perspirant is still required, if the vehicle is a Bicycle!!
And yup, in the dark in the morning when it's snowing and the traffic is somewhat heavy; it CAN certainly be stressfull!
When it's the most fun though is in the rain or in the snow, drafting a loaded schoolbus, about two ft back at 35MPH on a moderatly rough and slippery back country road winding its' way between the lakes, while trying to wave back at the kids waving thru the rear bus window!
.....I just never felt comfortable letting go of even ONE handlebar while pulling that time saving manuver!
Gravel trains presented a different problem: No kids to distract you; just the ocassional loose rock
But...no bus stops either!!
