[noir_lord]

In the UK it's the other way around, heaviest defers to lightest,

In order of right of way, On Foot, On Bike, On Horseback, In Car.

It makes sense, the consequences to me as a cyclist to a car hitting me are far more severe than to the driver so the onus should be on the driver as the operator of the two tonne metal box.

[jessaustin]

On many trails in western USA, horseback comes first because you can't really trust another person's horse not to do something harmful.

[noir_lord]

Same here practically but the order of precedence I described applies to on the highway.