LONDONDERRY — One of the most dangerous intersections in town is getting a traffic light.

The state Department of Transportation will install a light on Mammoth Road at the intersection of Litchfield, Bartley Hill and Stonehenge roads.

Left turning lanes also will be installed on Mammoth Road, according to DOT project manager Alex Vogt.

Interim police Chief William Hart said that section of Mammoth Road is a frequent scene of accidents due, in part, because of the number of cars traveling through the area and because of speed.

"The speed limit is posted at 35 mph, but people routinely do 40 (mph) plus," Hart said.

Accidents are most frequent during commuting hours because the road is a major route through town, Hart said.

Bartley Hill and Stonehenge roads both end at the intersection with Mammoth Road, which adds to the problem, Hart said.

Part of the construction will eliminate that problem by having Bartley Hill Road intersect Stonehenge 100 feet away from Mammoth Road.

The result will turn the intersection into a four-way stop instead of a five-way intersection, Vogt said.

Leeann Ethridge, who lives at 421 Mammoth Road, hopes that will be enough to keep motorists from crashing into her front yard. She said she won't be happy with a traffic light directly in front of her house, but knows that something needs to be done.

She used to have a fence in her front yard, but after it was hit repeatedly, her husband, Thomas, decided it wasn't worth fixing anymore.

"Ninety percent of the accidents end up in the front yard," Ethridge said.

The state will install a fence on the side of her yard that borders Litchfield Road.

Ethridge already is convinced she won't enjoy living at the intersection with a traffic light, but she doesn't think she will have an opportunity to leave anytime soon.

"We kind of want to sell, but we don't know what it's going to be like to get out of the driveway," she said.

Vogt said the $2.6 million project will start next month and is scheduled for completion in 2010.