Orbit I-393 speed limit in New Hampshire
Mostly 55 mph: about 86% of I-393 in New Hampshire is posted at 55. Limits run from 45 to 55 mph along the way.
How much of I-393 is at each limit
Questions
What is the speed limit on I-393 in New Hampshire?
Mostly 55 mph: about 86% of I-393 in New Hampshire is posted at 55. Limits run from 45 to 55 mph along the way.
What is the highest speed limit on I-393 in New Hampshire?
55 mph, on 86% of its length in New Hampshire.
Can the limit be lower than this?
Yes. Work zones, bad weather and local signs can set a lower limit. The posted sign is always the limit.
How does Orbit know the limit?
Orbit uses state and federal road data and OpenStreetMap, and drivers confirm limits from the road. In the app, the limit for the road you are on shows on the map and in CarPlay.
Posted limits as of October 2026, from state and federal road data and © OpenStreetMap contributors, measured by length of road. Work zones, weather and signs can set a lower limit; always follow the posted sign.