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District of Columbia/Major roads/Main

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The primary reference for road types is the District's [ Functional Classification Map].
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 [[Road Types (USA) | US road type standards.]] Lock the roads based on type after they've been set to current US road type standards and connecting roads are set up correctly and all other edits are complete for the segment.
;Minimum Locking Standard
Actual locks used may be more than the table below, depending on area circumstance. Please consult RC, SM, or appropriate AM for guidance
{| border="1" style="border-collapse:collapse;margin: 1em auto 1em auto; text-align:center"
|+ '''Locking Levels'''
| {{Freeway}}||5
| {{Ramp}}||4
| {{Major Highway}}||4
| {{Minor Highway}}||3
| {{Primary Street}}||2 (3 for one way PS)
| {{Street}}||1 (2 for one way S)
| {{Railroad}}||2
| {{Ferry}}||5
=== Speed limits ===