As we've previously discussed henry... you need to think about lines of sight when approaching a junction. In built up areas, you can't see what's coming round the corner until you're close to the corner. Also remember the fact that the driver is sat a metre or so from the front of the car, and bear in mind that the visibility is even more restricted if the object is on the pavement. In these cases, you physically can't see what's a few metres along the pavement before the front of your bonnet is sticking out past the pavement. You cannot expect drivers to have x-ray vision. It is basic geometry - I would draw you a diagram if I thought it would help. But I'm starting to doubt it will! The answer: everyone should be careful when approaching junctions, including pedestrians, cyclists, and of course drivers.