In theory you are supposed to know, otherwise you'd probably fail the driving test. I know there is a problem with too many signs in some places, but your original point is valid."Supposed to know" may be the intention, but many don't (or have forgotten, or think they might get away with it... which they probably will with the current state of policing).
A main road near me* had cycle tracks painted on both sides of the road - obviously narrowing the road. The opportunity was taken to reduce the speed limit as well (60mph/40mph down to 30mph). The interesting part is that there are some detector wires embedded in the cycle track and the pavement. And, yes, there are cyclists still cycling on the pavement.Well, around Weston Village (Bath) they've been painting cycle logos on the road and dedicating half of it for those buggers where there's hardly room for cars to pass anyway. Since when did cyclists pay towards the provision and upkeep of roads (general taxation notwithstanding)?
See my comment at #475. Same road as above (*) at end of cycle track. A non-enforceable advisory 20mph with speed trap flashing at legal 28mph drivers.Re prpr's rant on 20 mph speed limit signs, I've just spent a few days in Birkdale/Southport and the lampposts there are festooned with them. No one takes any notice, even the local buses travel at 30.