Parallel pavement lips can catch you off guard. They can grab the tire sidewall alternately at the part that going downward, then the part that is going upward and in near instantaneous succession pull the wheel hard one way then push it the opposite way.
Wet wood and metal is very slippery. A bunch of people I know at one point or another crashed on the same wood bridge that has a 90 degree turn at the start. Frost on wood / metal is even worse.
The ramp to the underground parking at the university where the bike cage is located has metal grating to shake some dirt off entering cars. Miniscule contact area with slick tires, fishtailed going down it once, decided to walk it after that.
A few spots in the park have 1" wood edging between the MUP pavement and the grass. Crossed that at a shallow angle once and wiped out. I know another guy who broke his arm on the same thing in a different spot.
One surprising thing to watch out for are hoses. If you go one at a shallow angle it will roll and throw you off. I was riding with a guy who crashed on a garden hose being used by a contractor cleaning graffiti.
>>1681952>Dude you can't see a sign lmao? 