Yes they seem very strong luckily, the van didn't see me cycling along in the opposite direction (1000 lumen light and high vis jacket are quite hard to spot) , he then turned right across my path and basically drove into me head on. Knocked me flying, bike went under the front of the van!
The only reason it wasn't worse was because the point of impact was quite slow, I was going at about half normal speed due to the snow, I saw that he hadn't seen me and managed to swerve slightly as I screamed at him, I think due to me shouting he was braking as he hit me.
So I'm grateful it wasn't worse, bike has a slightly bent mudguard, not bad considering it slid along a road and went under a van!
Ben