Freezing and repeated thawing doesn't just create potholes.
National Grid says a wild swing in temperatures can also affect underground pipes.
The company showed NewsChannel 13 a new truck they are using to detect gas leaks.
The truck drives along the streets and sensors go off if it detects natural gas.
The sniffer trucks are a proactive step to stop leaks.
National grid reminds you to use your senses, natural gas has an odor similar to rotten eggs.
Also look for dust or bubbles in water outside your home and listen for a whistling sound.
If you suspect a leak, get out of the house and call 911, then call National Grid.