HOV "Lanes"

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Re: HOV "Lanes"

Postby AlanOfTheBerg » Fri Jul 26, 2013 11:19 pm

If the HOV lane is just part of the main roadway, I don't think they should be mapped. If it is a lane which is significantly and/or physically separated. Map the kind which you totally cannot get out of whenever you need to (a solid white line doesn't count) and which often skips some exits and you simply have no choice.
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Re: HOV "Lanes"

Postby AlanOfTheBerg » Sat Jul 27, 2013 12:56 am

In my admittedly limited experience with HOV lanes, the ones which run on the same unbroken stretch of roadway, not physically separated, the HOV lane often is just about as busy as the rest of the freeway.
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Re: HOV "Lanes"

Postby AlanOfTheBerg » Sat Jul 27, 2013 2:54 pm

AndyPoms wrote:If it's just a lane and not a separate road, the GPS system (not Waze, but the actual GPS system) doesn't have the resolution to know which lane you are in, so it won't be able to tell if you are in the HOV lane or not.

True enough. But that gets better in generations of phones and devices. We know we've seen drives which clearly show lane-specific correct detail and that is likely to happen more often. I'm actually moving towards the fence on whether to map the close-in HOV lanes. Drivers certainly will expect the guidance so how to provide it? Is that perhaps part of the future lane-guidance feature?


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Re: HOV "Lanes"

Postby AlanOfTheBerg » Tue Jul 30, 2013 6:29 am

james9becker wrote:In response to CBenson's comments, another place where there are speed differences is at stop lights where the wait time is dependent on the direction taken after the light. It becomes even more fun when this intersection is at a freeway exit. Then there can be a multitude of potential directions. With different signal timing and right turn on red.

Waze already stored every segment-to-segment transit time. But this is quite a different situation than HOV lanes.


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Re: HOV "Lanes"

Postby AndyPoms » Fri Jul 26, 2013 11:20 pm

Well, it's not a restricted road then, it's a restricted lane.

In my opinion, HOV/HOT "lanes" that are separated from the main road should be mapped, those that are just separate lanes (with out dedicated entrances & exits) should not.
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Re: HOV "Lanes"

Postby AndyPoms » Sat Jul 27, 2013 11:10 am

If it's just a lane and not a separate road, the GPS system (not Waze, but the actual GPS system) doesn't have the resolution to know which lane you are in, so it won't be able to tell if you are in the HOV lane or not.
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Re: HOV "Lanes"

Postby AndyPoms » Mon Jul 29, 2013 11:16 am

The lane guidance in other GPS units is done essentially by segment - it doesn't actually know what lane you are in, but information about the number lanes on the segment you are on.

Besides at a 95% confidence level, civilian GPS is only accurate to 7.8 meters (just over 25 feet)(1) - and minimum lane width in the US is 12 feet (2) so 25 feet covers two full lanes on either side.
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Re: HOV

Postby AndyPoms » Mon Jul 29, 2013 1:45 pm

jwriddle wrote:
AndyPoms wrote:The lane guidance in other GPS units is done essentially by segment - it doesn't actually know what lane you are in, but information about the number lanes on the segment you are on.

Besides at a 95% confidence level, civilian GPS is only accurate to 7.8 meters (just over 25 feet)(1) - and minimum lane width in the US is 12 feet (2) so 25 feet covers two full lanes on either side.


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I looked it all up & I cited my sources (the little numbers in parentheses).
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Re: HOV "Lanes"

Postby bgodette » Tue Jul 30, 2013 4:30 am

Non separated HOV/HOT lanes should remain unmapped and left until we get some of the additional attributes from Google. This will include number of lanes and hopefully you can specify how many lanes are HOV/HOT. That combined with car profile in the client can separate out average speed data between HOV/HOT and regular lanes.

Or we wait 5 years for all our phones to have GPS chips that use the three (four?) major GPS systems at the same time for sub 1 meter accuracy. :ugeek:
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Re: HOV "Lanes"

Postby bgodette » Fri Aug 02, 2013 9:53 pm

sketch wrote:This will probably affect the "current traffic" speed, yes, but it shouldn't affect historical data, provided that the GPS traces are accurate enough. That's done with later analysis once your drives are uploaded.
I agree that's the likely case. The client has to operate on the assumption you're following its directions as accuracy isn't yet high enough across all platforms to conclusively determine you've actually deviated two lanes width without a lot of false positives.

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