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New York/Speed limits
New York follows the national guidelines for adding speed limits to the map. There are a few items left up to local guidance which will be enumerated below.
- The NYS statewide maximum speed limit is 55 mph unless otherwise posted.
- The NYC citywide maximum speed limit is 25 mph unless otherwise posted.
National guidance recap
- The ONLY speed limits which should be added to the map are Regulatory Speed Limits. These are marked with black lettering on white rectangular signs.
- Speed limits should change where they legally go in effect. When a speed limit changes in the middle of a segment, a new junction should added to support the SL change. However a new junction should never be added for a SL if it will be within 200 feet of an existing junction, or potential junction.
Work zone speed limits
We only consider the regulatory signs, and never map advisory speed limits.
- Interim guidance in NY until the Speed Limit feature goes live to production to production in the client app.
- Only add Work Zone SLs if they are anticipated to persist more than a year.
- For projects expected to last less than a year:
- Add the regular underlying SL to the segments
- Document the WZ SL as a note in a UR with the keyword
mph WZincluded in the text.
- After the Speed Limit feature goes live in the production client app adding WZ SLs to segments will generally be allowed.
- Typically only projects which are expected to last at least 3 months should be added to the map.
- The underlying SL, and expected project completion date should be documented in a [CONSTRUCTION] UR with the keyword
mphincluded in the text.
- Projects of shorter duration may be added as well, IF the editor has access to frequent status updates on the project, and is willing to monitor and adjust as soon as the SL is restored.
Where speed limits change
The NYS Supplement to the MUTCD stipulates that a Speed Limit sign shall be placed at, or as near as practicable to, the beginning of a speed limit.
When adding speed limits to WME we should try to be as accurate as reasonable, while still preserving turn delays. Therefore if a speed limit changes in middle of a segment we will create a new junction to support the SL change. However if there is already an existing junction, or we can see the need to create a new junction to connect another segment to the road within 200 feet of the speed limit sign, we should mark the SL change using that existing (potential) junction node.
If at the editor's discretion in consultation with local managers, it is determined that a new junction to support a SL change between 200 - 1,000 feet away from a junction would have a negative impact on turn delay calculations, they may instead affect the SL change at an existing (potential) junction up to 1,000 feet away from the SL sign. This may be because the SL change is posted in middle of turning or exit lane where traffic regularly backs up from the following junction to before the position of the SL sign.