Hey thanks.
A red waypoint means you need to stop within 50 feet of it, which should end the mission. (Does that answer your question?)
And yeah I struggle to think of proper sounding names, so silly ones it is.
How do you stop? The in-game tutorial tells you to "use the brake", but I don't know what button that is.
Throttle down to zero, then keep holding throttle down to apply the brake.
(Sorry, I didn't realise it wasn't documented!)