olemus
sobiva või lubatava kiiruse ületamine või selle suurus

Wiktionary:
verb
1. (intransitive) to travel excessively fast or beyond the permitted rate
2.(usually transitive, sometimes intransitive, chiefly mechanics) to operate an engine or machine too fast
noun
1. speed that exceeds a reasonable or permitted rate

ülevaateid
https://en.wikipedia.org/wiki/Overspeed