jondrush wrote:Why are we even debating this?
jondrush wrote:Nearly every ramp diverges at one or both ends. So a two-way joined to 2 one-way is three segments. Two one-ways from start to finish is two segments...
Plus you've taken away all sorts of decisions and penalties that the routing engine has to apply.
That is the crux of the difference between ramps and roads. Ramps almost always diverge. I've done lots of ramps each way. Editing is so much simpler without two-way ramps. I don't need to address 'symptoms', they just flat-out work, with virtually no URs.
Why are we even debating this?
harling wrote: So you are correct that using two-way ramps sometimes results in one additional segment. (The only time it reduces the count by one is when you have a single two-way segment, which is rare.)
harling wrote:What is reduced is the total length of roadway on the map: replacing two very close, parallel stretches of road with one. That means one segment to adjust to get the geometry right instead of two; one segment for a sometimes flaky GPS to snap to instead of two.Plus you've taken away all sorts of decisions and penalties that the routing engine has to apply.
Such as? Two-way segments maintain independent speeds for each direction, and as I understand it, junctions keep track of the cost of each segment transition separately.
jondrush wrote:I don't care about total length of road on map, why would anyone? I only care about segment count, junction complexity and naming complexity. Two-way ramps are typically the simplest regions of the ramp, straights and simple bends... Why do we care about flaky GPS on close ramps? There is only one solution to a ramp, you get on, you get off...
When we had a splitting tool I would adjust geometry once, then split. I've made a request of Waze to see if we can somewhat duplicate this functionality.
Every junction is a calculation that the routing server has to make. One-way to two one way is one decision. Two-way adds three decisions, at least.
Also more ways for the editor to get it incorrect.