Drivers need to leave their home at least 5 mins (10 mins for snow) earlier to scrape off ice and snow off their cars.
Fed up of seeing drivers just scraping a porthole - about a fifth of the windscreen, leaving the rest of the windows still covered with ice or snow. This is stupid and illegal
Also when it snows heavily, people don't remove the snow from their car roofs. Seen it where they braked and the snow on the front half of the roof falls onto the windscreen. Wipers can't cope with that snow - plus besides, you can damage them if you attempt to shift thick snow using wipers. They have to physically get out - causing traffic problems.
Also drivers that pour water onto their windscreens, don't realise that the water freezes. I sprained my wrist a few years ago after slipping on ice caused by a driver doing this. Warm water can crack your windscreen.