Context definitely matters. If you were to look at the accident statistics I'm sure they'd show most accidents happen at low speed--because most accidents happen where there's most traffic, which will generally be in towns or on overcrowded motorways. A clear motorway or freeway is one of the safest roads to travel on, despite also being the fastest, because everyone's going in the same direction at roughly the same speed and so there's less opportunity for accidents.
(Of course, when an accident *does* happen on such a road it'll usually be a big one, but those are very, very rare).