I wouldn't consider the UK instructions clear. "In good time" is a broad church - it would be interpreted very differently by different people. I'd like to know if you should signal 10 metres before or 20 metres before.

As for the craze for hasty decisions, it's absolutely stupid. The wife of a friend was crushed by a learner driver as she cycled on a back road she'd chosen for her route because she'd meet few drivers. The L-driver had mixed up accelerator and brake and stamped on the wrong one.