Traffic on I-93, I-393 and New Hampshire Route 106 will be altered this weekend to handle the 25,000 vehicles expected to attend the NASCAR Cup Series Race at the Motor Speedway in Loudon.

The race starts Sunday at 2:30 p.m., with maximum traffic congestion expected to occur in the late afternoon and early evening. Traffic control measures include:

■The I-393 eastbound off-ramp to I-93 South will be closed from approximately 3:15 p.m. to 9 p.m. Motorists attempting to use the ramp will be diverted to Stickney Avenue from which they can access I-93 South at Exit 14.

■The I-93 Exit 14 southbound off-ramp to Loudon Road and the I-93 Exit 15E southbound off-ramp to I-393 eastbound will be closed from approximately 3:15 p.m. to 9 p.m. Motorists will be directed to use Exit 15W to reach Exit 14 destinations and use Exit 16 to reach I-393 eastbound.

■At the I-393 and I-93 interchange, the I-93 northbound off-ramp to I-393 West (Exit 15W) will be closed from approximately 3:15 p.m. to 9 p.m.

■On Sunday, the morning of race day, Route 106 will include two northbound lanes and one southbound lane from just north of I-393 to the intersection with Beck Road. A third northbound lane will be added from Beck Road northerly to the NHMS South Gate. Left turns from Route 106 will be prohibited at Mudgett Hill Road, Voted Road, and Clough Hill Road.

■Between 3:30 p.m. and approximately 8 p.m., Route 106 northbound traffic will be detoured easterly on Route 129 to Route 107. Clough Hill Road will be closed for non-local traffic. Continuing north on Route 107, detoured traffic will have the option to use NH Route 140 westerly to rejoin NH Route 106 in Belmont or continue further north to Route 106 in Laconia.

■Between 3:30 p.m. and approximately 8 p.m., Route 106 will be configured with multiple southbound lanes. Access to NH Route 106 from the following roads will be restricted to right turns only: Soucook Lane, Brook Circle, Tote Road, Shaker Road, Beck Road, Mudgett Hill Road, Voted Road. Clough Hill Road will be closed to all traffic.

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