On Fri, 2013-03-15 at 11:53 +0100, Simone Saviolo wrote: > 2013/3/15 Pieren <[email protected]> > > It is for navigation. Imagine a corner right before an > intersection: the > > navigator would warn you that you'll have to give way or to > stop, and you'll > > prepare the corner accordingly. > > > I don't know any commercial car navigation system that warns > you about > give-ways or stops. > > > This doesn't mean that future navigators shouldn't.
I would very much disagree with you here, it is up to the driver to remain alert and to drive within the limits of what they can see. The golden rule is "never drive so fast that you cannot stop, safely, within the distance you can see to be clear". On single track roads half that distance. > > Perhaps because it has no influence on the route > itself. > > > Don't mix routing with navigating. Give ways and Stops do influence routing as they add time to a journey. A longer route that avoids give ways and stops can often be quicker. Particularly turns which require a gap in traffic in both directions on the road you are joining. (A right turn in drive on left countries, and a left turn in drive on the right countries. Most drivers will select routes avoiding some junctions due to the time taken, the queues that can form etc. Providing this information to routers will help them produce better routes. A junction with stop sign will take longer to accomplish as the presence of the stop sign indicates reduced visibility. > > And that the decision to stop or go depends on the actual > traffic. > > > Also the decision to stop because a traffic light is red. Also the > decision to stop because there's a queue. This doesn't make it > pointless to signal that there is a traffic light ahead, or that > queues may be possible (there's even a road sign for that). > Again traffic signals affect the time taken to negotiate a junction, it may be more or less time than a give way, but it is still part of the algorithm. > > > And you cannot rely on OSM for your driving decisions. > Imagine that your navigator warns you 4 times to give way and > the > information is missing in OSM for the fifth... > > > Still better than having none. > Absolutely wrong, obeying traffic rules is 100% the drivers responsibility. There already enough numpties on the road, without giving them another reason to blame the satnav. A satnav should only use the presence of give ways and stops to calculate routing times and hence the optimum route. Phil (tripoint) _______________________________________________ Tagging mailing list [email protected] http://lists.openstreetmap.org/listinfo/tagging
