> On Sep 18, 2018, at 6:19 PM, Joseph Eisenberg <joseph.eisenb...@gmail.com> > wrote: > > So on the boundary=administrative admin_level=6 for Rogers County, we could > have something like maxspeed:type:default=45mph
Except that more typically there will be different default speed limits on each of the various OSM highway classifications. So maybe something more like “maxspeed:default:residential=25 mph”. But I imagine there are other types of tags that might benefit from the ability to give defaults for a geographic area. So possibly it would be better to have “default:maxspeed:residential=25 mph” where and entire “default:*” namespace is created. For California something like: “default:maxspeed = 65 mph” // State wide maximum for all roads unless otherwise tagged or overridden by a more specific default “default:maxspeed:primary = 55 mph” // More specific default speed limits specific OSM road classifications “default:maxspeed:secondary = 55 mph” “default:maxspeed:tertiary = 55 mph” “default:maxspeed:unclassified = 30 mph” “default:maxspeed:residential = 30 mph” “default:maxspeed:service = 15 mph” > On Sep 18, 2018, at 10:15 PM, Mark Wagner <mark+...@carnildo.com> wrote: > > . . . > > The third law: RCW 46.61.400(1). "No person shall drive a vehicle on a > highway at a speed greater than is reasonable and prudent under the > conditions and having regard to the actual and potential hazards then > existing." > > As a highway engineer pointed out to me recently, most county roads, > especially unpaved ones, are designed around a speed limit of > "reasonable and prudent". The 50 MPH limit established by RCW > 46.61.400(2)(b) simply sets a firm upper boundary; it's quite possible > to get a speeding ticket at a lower speed. > > Sure, you can put a number on any road. But for most rural roads > without speed-limit signs, the number is unrelated to how fast you can > drive on that road. > California, and I suspect most if not all other states, has a reasonable and prudent clause in the speed statutes too. So depending on conditions, especially weather conditions, theoretically you can get a speeding ticket while driving under the signed or prima facia speed limit. However I think that is a diversionary argument that basically implies that we can’t tag any road with a speed limit because the default or signed speed limit can be trumped by a reasonable and prudent clause in the motor vehicle code. I am a little curious about the highway engineer’s statement though. While not a civil engineer, I’ve had some interest in the field and the highway design books on my shelf (admittedly pretty old ones) all work off a design speed that is a specific number. Not a nebulous “reasonable and proper”. The design speed used to compute required sight distances, turn radii, ruling and maximum grades, etc.
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