On 31 May 2012 11:23, Colin Smale <[email protected]> wrote: > Maybe I am just having a "blond moment" but I can't see any way of capturing > access restrictions "except for access". Loads of country roads are > signposted as "max width 6'6" - except for access" which implies a wider > vehicle will fit (just). There are other restrictions which are sometimes > qualified in this way, like "No HGVs except for access" but when they > specify a class of vehicle then the tagging is obvious - in this case > "hgv=destination". But this can't be done simply with maxwidth (and > maxweight, maxheight). > > As I can't see any direction on the wiki I thought I would let up a balloon > here to see if anyone has come up with a tagging solution for this (in my > experience) typically British phenomenon.
Where I've come across these "exceptions" to the restrictions, I've used something like: maxweight:exception = loading;permit_holders The other sensible way of doing it that I can think of would be to have a separate key for each class of user taht has the exception. So something like maxweight = 7.5 T maxweight:loading = no maxweight:permit_holders = no The first approach better reflects the reality of the signs -- it's not a case of multiple restrictions; it's one restriction, with a list of exceptions. The second second approach is more flexible though, and is more consistent with the documented maxspeed:hgv tag. However, I think the second method is slightly ugly, in that we have to have a "no" value to remove the original maxweight. With either method, it would be good to document a list of simple words to express common exceptions. Neither approach had been particularly heavily used though, as far as I can see from taginfo. Robert. -- Robert Whittaker _______________________________________________ Talk-GB mailing list [email protected] http://lists.openstreetmap.org/listinfo/talk-gb
