Because wet roads means it going to be slippery, cold also suggests it could be icy. Thus retard drivers. Edit: Wouldn't really call them retard drivers, carefuls a better word.
Move on mate. She's interested but also seeing if she can do better with other lads. If that makes sense. Don't ruin your friendship, just like lower the tone down and slowly reduce the amount you talk to her. It's a ball ache at the start but you'll find it a lot easier in the long run.