Sorry if this was discussed before.
Is there such a thing as POI for STOP signs and traffic lights?
It would be really nice to know about them in advance and
map companies would probably be interested in having this information too, since it would help them to calculate more efficient routes.
You need to be alittle more specific in what you mean. Are you talking every stop sign and red light in a every town or city? I don't know of any mapping that uses that info, just street names and highway.
May not be practical in many places. In larger cities, such as NY, the thiing would be going off constantly..cz
Maybe not as POIs, but as a characteristic of the roads that would be useful information for calculating efficient travel routes. Ask Navteq if they have considered that.
I would think that would make such a big file that it wouldn't fit on a GPS. Navteqs site has the option to update and change information on streets, but don't remember an option for signs and such. Haven't seen the changes for neighborhoosd yet, but that is supposed to be the way to get new areas and speeds into the database, just go in and update your info and they will incorporate it into the next change.
but probably will not happen. GPS units should do a little better on arrival time, by lowering the speed you will travel in the city area. Currently the units assume you will get every stop light and pass through stop signs with no delay in arrival time.
This explains why the Garmin ETA is pretty good for the freeways (outside of rush hours, unless the traffic signal detects delays which are indeed taken into account in the ETA) but too optimistic on surface roads. When I need to be somewhere at a given time, I always add a few minutes to the GPS ETA for the surface road delays.
I don't think that the GPS companies would see a lot of benefit from putting data about the presence of stop lights into their files. The effects of stop lights would probably depend upon whether or not the lights are synchronized, and upon the time of day, so knowing that a light is present would not necessarily improve the accuracy of travel time predictions.
The approach that is taken by TomTom - and I assume by other companies that have a system for feedback from customer GPS units - is to record the actual travel times on surface streets as a function of the time of day and day of the week. The average travel times should normally give a good estimate that includes the delays due to stop signs and red lights.
With best wishes,
- Tom -
The town (it's really a hamlet, as defined by the county) in upstate NY where I grew up as a kid STILL has NO stop signs (or any type of traffic sign for that matter), traffic lights (not even a blinking yellow one), sidewalks (you just walk along the side of the two lane country road that passes through a handful of houses). It's still like it was from years and years ago of the past with a volunteer fire dept and one man post office.. etc., etc.
In some ways I still miss it.. even in today's fast paced world.
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