Road category policy for India

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Re: Road category policy for India

Postby Darryl-BHP » Sat Apr 30, 2011 9:24 pm

Driving on one side of the road or the other is country-specific and is not the reason for road directions getting automatically changed. This happens only because the combined width of the two directions of the road isn't enough for the average phone GPS to differentiate between them. You can see this for yourself by going to the map editing page ('Cartouche') and turning on the 'GPS Points' layer to view the tracks along a city street that has been created as two one-way roads. For most such roads that I have reviewed, almost all tracks in both directions appear along one side/direction and the other 'road' is practically free of GPS tracks.

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Road category policy for India

Postby Darryl-BHP » Tue Apr 26, 2011 10:42 am

As seen, the base map appears to have most roads categorized only as 'Street' or 'Freeway' except for a very few shown as 'Primary Street' which may be a result of editing. Where several levels of definition are available, this limits the information available to a Wazer new to that part of India.

I propose the following policy, knowing full well that it will take several months to make significant changes and may never be 100% complete.

Freeways: Expressways such as Mumbai-Pune and Vadodara-Ahmedabad (please post here regarding other expressways in your part of India) and also GQ (Golden Quadrilateral) and NSEW (North-South East-West) trunk routes. Possibly include Mumbai's Western and Eastern express highways, Kolkata's Eastern Metropolitan Bypass and some of the Ring Roads in different cities.

Major Highways: All other National Highways, arterial roads within cities and the best of the State Highways.

Minor Highway: Remaining State Highways, other well maintained and well traveled inter-city routes and city bypasses.

Primary Street: Major through routes from one part of a city to another, also well maintained and traveled rural roads.

Street: All other roads except private and service roads.

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Line Road vs two one-way roads
Waze has provided a guideline that only roads separated by a generous median should be shown as two one-way roads. In the base map for India, however, city streets and highways with a minuscule divider are shown as two one-way roads instead of as a single road with a line. This has resulted in one side or the other reverting to a two way road wherever not locked, due to GPS being insufficiently accurate to determine on which side of the road a Wazer happened to drive.

I propose that all city roads less and highways than 3+3 lanes be identified as 'line road' instead of two separate one-way roads. Where a 2+2 lane road has a flyover with parallel roads, it can be split in three parts showing a two-way flyover with line and two one-way roads alongside. This will actually improve the navigational capabilities and help those Wazing the road for the first time.

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Road geometry at junctions
In the base map, a large number of road junctions show short curved roads at the four corners. A few of these are actually free left turns, but the majority are just a widening at the crossing. The indirect result of such mapping is that sometimes Waze instructs to 'Bear Left' instead of 'Turn Left' which can be confusing. I propose that, with due reference to satellite imagery and/or ground reality, these curved roads can be removed to clean up the map and the navigation.

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Thank you for reading these suggestions, and do please post your opinions along with other possible map improvements that may come to mind.
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Re: Road category policy for India

Postby cshubhra » Fri Jan 06, 2012 10:00 am

Good to see more editors coming up in India :D
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Re: Road category policy for India

Postby cshubhra » Mon Oct 24, 2011 5:00 am

Darryl-BHP wrote:As seen, the base map appears to have most roads categorized only as 'Street' or 'Freeway' except for a very few shown as 'Primary Street' which may be a result of editing. Where several levels of definition are available, this limits the information available to a Wazer new to that part of India.

I propose the following policy, knowing full well that it will take several months to make significant changes and may never be 100% complete.

Freeways: Expressways such as Mumbai-Pune and Vadodara-Ahmedabad (please post here regarding other expressways in your part of India) and also GQ (Golden Quadrilateral) and NSEW (North-South East-West) trunk routes. Possibly include Mumbai's Western and Eastern express highways, Kolkata's Eastern Metropolitan Bypass and some of the Ring Roads in different cities.

Golden quad is a good option. As a start I would say the following
a. At least four lanes
b. Speed limit of 80 KM/h - And it is possible to do that
c. No traffic lights

As per the defn, expressways, and golden quadrilateral qualify but not Mumbai's Western Express Highway, Kolkata's Eastern Bypass. Ring roads may possibly qualify. Use your discretion

Darryl-BHP wrote:Major Highways: All other National Highways, arterial roads within cities and the best of the State Highways.

a. Speed limit (Or its possible to do) - 60 KMPH
b. Less traffic lights
c. Use your discretion if it passes through a major city. Often it is not possible to achieve a consistent speed of 60 KMPH through a city highway, though you can reach speeds of over 100. Don't consider the F1 types, but nervous drivers like me when thinking of the speed.


Darryl-BHP wrote:Minor Highway: Remaining State Highways, other well maintained and well traveled inter-city routes and city bypasses.

All other highways.

Darryl-BHP wrote:Primary Street: Major through routes from one part of a city to another, also well maintained and traveled rural roads.

All roads regardless of speed, which can be considered as the arterial road, and you want to encourage routing through that, to avoid multiple turns. Discretion of the AM

Darryl-BHP wrote:Street: All other roads except private and service roads.
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All other roads, except the ones you want to discourage routing through

Parking Lot Roads: Roads you want to possibly discourage routing, and real parking lot roads

Ramp: Roads giving access to a freeway/major highway. You would like to use it to merge / leave a highway, but otherwise discourage routing through it.

Walking Trail: Narrow roads which are walkable, bikable but a car would not ordinarily go in
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Re: Road category policy for India

Postby cshubhra » Sun May 15, 2011 6:22 am

I personally find that having roads with dividers as two one way roads is better. It automatically restricts U turns, except at allowed places. The problem mentioned above, I have seen as well, did not know that it was because of inaccurate GPS points!!! I will keep the two one way roads locked, to avoid turning them to two-way roads!
Another problem in Kolkata ... most people don't respect one way roads, and often drive in the other direction!!!

I am trying to connect to other users in Kolkata, so that we can come up with better maps together, but unfortunately they are very few, and very non-regular.

Regarding the road classification, I agree and had started doing that since last 1-2 days, before seeing your post.

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Re: Road category policy for India

Postby cherianchris » Thu Jan 31, 2013 4:45 pm

Dear Sk,

Hope this helps !

1. Handling Restricted Lanes

2. High-Occupancy Vehicle Lane

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Re: Road category policy for India

Postby cherianchris » Fri Jan 18, 2013 7:28 pm

lunarplexus wrote:When would it be absolutely required, do you think?


In the case mentioned earlier by you, where Waze was asking you to take three Right Turns.
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Re: Road category policy for India

Postby cherianchris » Fri Jan 18, 2013 6:06 pm

lunarplexus wrote:I was considering deleting them if they have no access since they would not be consequential to routing.


They are purely for local traffic to enter and exit. For now, if the segment does not have any speed data, delete it. We can come back at a point in time when Delhi is sufficiently mapped, and draw them wherever needed.

lunarplexus wrote:As for double-line roads, I only change them if they are relatively short and have a lot of unrestricted junctions as per best practice guidelines. Maybe I should narrow my parameters a lot more? I do consider it a lot before changing them but I guess I just got to think a lot more eh :)


India will have its own Wiki, in some weeks time. It will specify the detailing required. For now, avoid changing segment composition unless absolutely required.

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Re: Road category policy for India

Postby cherianchris » Fri Jan 18, 2013 3:16 pm

lunarplexus wrote:Oh man, I've had that so horrible wrong. Thanks for clearing that up. So, service alleys - can they be deleted?


Why would you want to delete Service Alleys ? Try to determine the POI in which these are situated, and map them if they satisfy the guidelines.
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Re: Road category policy for India

Postby cherianchris » Fri Jan 18, 2013 3:12 pm

lunarplexus wrote:Exactly. Instead of a u-turn, it asks me to take three right turns until I get back to the original road going the right direction. Of course, it wasn't a problem when this was a double line road.


Split the segments and make them two directional again. Do not combine roads or split them without thinking twice. Segments have tons of data stored in them, and when you delete a segment, routing becomes wonky.

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