SALEM, N.H. (AP) — Northbound traffic on Interstate 93 in Salem will be temporarily reduced to one lane as part of the $41 million widening and reconstruction project around Exit 2.

The Department of Transportation says work to install new guardrails near the northbound bridge at Exit 2 will occur between 9 a.m. Sunday and 6 a.m. Monday.

The right lane will be closed during that time, and officials are warning drivers to remain alert.

Farther north, there will be significant traffic pattern changes around I-93 and other roads due to a race at New Hampshire Motor Speedway on Sunday.

Copyright 2012 The Associated Press.