from the Maryland Department of Health Link
Maryland's State and local traffic engineers receive requests to raise, lower, or simply review speed limits on streets and highways throughout the State. Here is how speed limits are set and how speed limits affect traffic and safety.
Speed limits for various streets and highways are set by Maryland vehicle law. In many instances, these statutory limits do not account for actual traffic conditions important in the safe and efficient movement of traffic. The law allows these limits to be raised or lowered based on traffic engineering studies.
Speed limits are set higher or lower than the statutory limits when one or more of the following circumstances are present:
After a speed limit is established, changes could prompt a new traffic engineering study to determine if the speed limit needs to be raised or lowered.
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