Breaking out of #519 (comment) where I proposed to enable U-Turns by default.

Response by @TheMarex:

I don't think it is a safe assumption that executing a u-turn is in general always possible. This can lead to absurd (and unsafe) suggestions like doing u-turns in the middle of high traffic streets.

How should a user know that uturns should be enable for a certain waypoint?

This can lead to absurd (and unsafe) suggestions like doing u-turns in the middle of high traffic streets.

Sometimes these u-turns will be the right move though? The alternative would be doing a loop around the block then (eg three right turns and one left turn instead of one uturn)?

Isn't this just a question of penalizing u-turns harshly and potentially also differently depending on road type, allowed speed, etc?