Southbound Route 8 in Etna will be closed overnight Tuesday through Friday, Dec. 9-12, PennDOT announced.

The closures between Kittanning Street and the Route 28 interchange are scheduled for 10 p.m. to 3 a.m. each night. The ramps from southbound Route 8 to northbound and southbound Route 28 also will be closed, weather permitting.

Crews will be repairing overhead sign structures.

There will be three posted detours:

Southbound Route 8

From southbound Route 8, take the ramp to Kittanning Street in Etna;

Turn right onto Kittanning Street;

Turn left onto Butler Street;

Turn left onto Freeport Street;

Turn right onto Bridge Street;

Turn right onto the ramp to South 28 toward Pittsburgh;

From southbound Route 28, take the left-hand ramp to 40th Street Bridge/Lawrenceville (Exit 3A);

Cross the 40th Street Bridge;

Turn left onto Butler Street;

Follow Butler Street back to the 62nd Street Bridge.

Southbound Route 8 to Southbound Route 28

From southbound Route 8, take the ramp to Kittanning Street in Etna;

Turn right onto Kittanning Street;

Turn left onto Butler Street;

Turn left onto Freeport Street;

Turn right onto Bridge Street;

Turn right onto the ramp to South 28 toward Pittsburgh.

Southbound Route 8 to Northbound Route 28

From southbound Route 8, take the ramp to Kittanning Street in Etna;

Turn right onto Kittanning Street;

Turn left onto Butler Street;

Turn left onto Freeport Street;

Turn right onto Bridge Street;

Turn right onto the ramp to South 28 toward Pittsburgh;

From southbound Route 28, take the Millvale (Exit 3B) off-ramp;

Continue straight onto East Ohio Street;

Turn left onto Grant Avenue;

Take the ramp to 28 North toward Etna;

Follow northbound Route 28 back to the Route 8 (Exits 5 A/B) interchange.

Conditions on major roadways are available online at 511pa.com. The site provides traffic delay warnings, weather forecasts, traffic speed information and access to more than 1,200 traffic cameras.