1) Bin lorry is reversing rapidly towards you, the road is too narrow for there to be anywhere else to go other than on to the pavement.
2) Blue flashy lights cause all of the motorists brains to disengage and they all make a dive for the kerb, and you were in the cycle lane...
3) On pavement shared use path illogically stops three or four feet from the junction you're waiting at according to the sign, and continues on pavement on the other side of the junction. You don't believe the sign, and you want to turn left and go down that way anyhow...
4) You could have sworn that you were on a cycle path a moment ago... when the hell did that end, why wasn't it labelled?
2) Blue flashy lights cause all of the motorists brains to disengage and they all make a dive for the kerb, and you were in the cycle lane...
3) On pavement shared use path illogically stops three or four feet from the junction you're waiting at according to the sign, and continues on pavement on the other side of the junction. You don't believe the sign, and you want to turn left and go down that way anyhow...
4) You could have sworn that you were on a cycle path a moment ago... when the hell did that end, why wasn't it labelled?