On Fri, Dec 7, 2018, 09:27 Greg Troxel <[email protected] wrote: > Paul Johnson <[email protected]> writes: > > > Seems like for route planning, the safe bet would be worst case scenario, > > lowest speed of the three possible maxspeed values. For example, a > > mountain road that (mostly motorcycle) traffic typically whips through > > curves at 70-90 km/h in a 110 km/h zone and have advisories (which are > set > > assuming family cars in the US) for 40-50 km/h is probably only going to > be > > traversable at about 30-40 km/h in a pickup. > > I more or less agree with the sentiment, and that probably does not lead > to bad routes, especially because ramps are where the goofiness is and > they are short. > > I see maxspeed:typical as being for the flow of mixed traffic that is > being reasonable.
Not sure this is a tag we even need in this case, since it can be inferred automatically from the GPX database. However, my specific example is a ramp where the advisory signs say 20 > mph but traffic is 99% of the time moving between 35mph (if there's a > cautious truck) and 50 mph (just cars, people familiar). The 20 signs > are because trucks going >50 keep rolling over, I think - which does not > make sense. > Keep in mind in the US and Canada, the advisory speeds are meant for average family cars, trucks are advised to go slower. Not saying that it's not always feasible to go faster than that, but it is the speed you're going to be able to traverse that section in a regular car on dry pavement without having to make abrupt moves or brake hard either due to the design of the road or typical traffic congestion. That said, Americans are aggressive drivers that typically take a much more aggressive approach than they're advised to, esp. in familiar areas... And by sudden or abrupt, think "would make a drink fall out of a 90s car cupholder", so they're seriously favoring smooth movement over today's late braking, corner cutting onto the shoulders or adjacent lanes, and track starts. The tippy truck signs indicate to large vehicle drivers that they will need to play on the side of extra caution because the location has been prone to rollovers, the advised speed is still tuned to cars, however. -- You received this message because you are subscribed to the Google Groups "Osmand" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
