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In Maryland we have a set minimum standard for locking roads based on segment type. Any road of a certain segment type must be locked at least to the rank (level) in the chart below. Roads may be locked higher for protection and special situations (areas with construction, tricky design, frequent mistakes, imaging inaccuracies, and the like), but should not be locked lower.
A great time to implement these locks is while bringing the road types of an area into compliance with the current US road type standards (FC and highway systems). Lock the roads based on type after they've been set to current US road type standards.
Note that these are minimums and, for protection, certain segments may be at higher lock levels. If you find a road locked to a higher level than its minimum, please leave it locked no lower than that level when you have finished editing.
Maryland 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.
Maryland law includes the following restrictions on the designation of speed limits. 
- Maximum speed limits are as follows, unless otherwise signed/posted:
|Residential||30 mph||35 mph|
|Other Locations||50 mph||55 mph|
- Speed limits may be revised after a traffic study and then posted, but no limit may exceed 70 mph
- Maximum speed limits for local jurisdictions include:
- 15 miles an hour in alleys in Baltimore County
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.
- Advisory speeds
- Truck speed limits
- Night speed limits
- 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.
Adding WZ SLs to segments is generally 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 map comment
- 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 Maryland supplement to the MUTCD stipulates that: A Speed Limit sign in a speed zone shall be located at or just beyond the point where the zone begins. If the zone begins at an intersection, the first Speed Limit sign for that zone shall be the Speed Limit sign normally erected beyond the intersection conforming to the standard sequence of signs at intersections.
Maryland is a state where the speed limits are absolute and are enforceable from statute; speed limits need-not be posted to be enforced.
When adding speed limits to WME we should try to be as accurate as reasonable, while still preserving data for 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.