PORTLAND — Two heavily used ramps that connect Interstate 295 drivers to Portland’s downtown will close tonight for an unspecified period of time.

Ted Talbot, spokeman for the Maine Department of Transportation, said the Exit 6B Forest Avenue off-ramp and the eastbound Forest Avenue on-ramp will be subject to closures through the fall.

The ramps must be closed so that construction crews can begin repair work on the Interstate 295 bridges that cross Forest Avenue and Preble Street.

“While highway work is always weather dependent, MaineDOT estimates that the bridge work will be done in September and night paving operations will finish up in October,” a state press release says.

Friday morning commuters should seek alternate routes. The DOT is suggesting drivers use the Franklin Street interchange to exit or enter Interstate 295 northbound.

Motorists should also remain alert as they travel through this area because traffic patterns and lanes could change within the new construction zone.