There is a minimum speed of 20 mph in the Boston Harbor tunnels
. Speed limits are mainly based on certain conditions such as:
– the number of vehicles on the road and their speed
Weather conditions and visibility
– situations that make it hard to see, including rain, snow, dust etc...
– Is the road surface rough or smooth; how much water, ice, or snow is on the road surface; and how wide is the roadway
Pedestrians or bicyclists
- People who are traveling along or across the road. You must lower your speed if there are poor driving conditions or hazards. It does not matter if the posted speed limit is higher.
If you drive 40 mph in a heavy rainstorm on a highway with a speed limit of 50 mph, you may get a ticket for driving too fast.