I have a very steep hill on my route which levels out after about 2 km. The first quarter is extremely steep and shortly after I enter it the bike skips around a little bit and by the time I'm at the bottom I'm gripping the handle bars and working pretty hard to keep it under control.
Is this a normal issue or is it indicative of problems with the bike? It happens both with my mountain bike and the touring bike. Less on the 29'er mountain bike perhaps due to the wider tyres and less twitchy handling.
There is a lot of acceleration right from the start going down.
Clarification:- I'm not concerned with other people's safety or traffic, my question is more about at what speed does my bike become unhandleable and/or fall to pieces.