Michael Tsang <mikl...@gmail.com> writes: > There are some highways which the quality isn't up to the usage, resulting in > congestion. Those highways connects high-quality motorway/trunk/primary > highways together for long distance traffic, but they only have a single lane > per direction, with lots of traffic lights, junctions, driveways, etc., > resulting in slow traffic. Because the absence of roads of proper quality, > those > low quality roads become bottlenecks in the whole network. > > A while ago, I tagged them all with highway=tertiary, consistent with the > quality of highways around the region, disregarding the actual kinds of > traffic > on the highway, and someone retagged them as highway=primary reflecting the > actual usage for long-distance inter-town traffic, and send a message to me > about that.
First, primary/secondary/tertiary is a UK notion. In the US, we have more or less used that for US highway, state highway, and other important road between towns. Overall, I think if people really care about which tag is used, then other than arguing about formal road networks, that's a clue that routing or rendering is being done based on just the type, rather than the other attributes. If it is one lane in each direction, then tag the lanes value. If there are stop signs ro lights, tag them. Then, a router can make routes that correspond to the physical experience of driving. Also, one lane in each direction is pretty normal for long-distance roads that really are primary, at least around me (US, outside of cities, not Interstates). Most highway=secondary are only one lane each way.
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