Please read carefully: one thing is a legal barrier (e.g. continuous line), one thing is a real barrier (e.g. guard rail, Jersey barrier). A legal barrier can be crossed by a vehicle if necessary, a real barrier not. We don't need to tag any exception for emergency vehicles. The routing software (now or in future) can be set to ignore legal barriers in emergency navigation. But if we don't tag in different ways legal and real barriers, there is no way to distinguish them. Think to this case: a motorway with continuous line and another with guardrail in the middle, and your destination is behind you. If routing software can't distinguish them, it will in both cases suggest to take the first exit 5 km ahead, and it may calculate a tortuous route along secondary ways. In your GPS you see "5 km ahead, go right" and a part of the route. If you don't know that your destination is just behind you, how can you imagine that the suggested route is misleading and you can simply do a U turn? In emergency situations you have many things to pay attention to and maybe you don't notice that GPS is wrong. I know these situations, I'm a fireman. Ok, usually you know your operating zone and you can ignore GPS, but why should we deliberately put incorrect data in the map?
By the way, in all cases of motorway junctions probably option b) is fine too, there is no much difference. But it is important to understand that using option b) for longer ways implies turning a legal barrier into a physical barrier, and that can produce unwanted and unexpected consequences. >Having said that there are certain restrictions which they would do well >to follow, such as maxheight and maxwidth. If it don't fit, it don't >fit, with or without blue lights! Exactly, and a guard rail is one of those restrictions that you can't pass with or without blue lights, we should distinguish it from a line drawn on asphalt. > why should we compromise "service" to the vast majority of real users for the hypothetical benefit of the very few. I can't see how the service can be "compromised". We can anyway refine and use divider proposal: http://wiki.openstreetmap.org/wiki/Proposed_features/Divider Cheers Alberto _______________________________________________ Tagging mailing list Tagging@openstreetmap.org http://lists.openstreetmap.org/listinfo/tagging
