Late-night commuters on the eastern end of the Massachusetts Turnpike should expect detours this week.
The state Department of Transportation says there will be off-peak ramp closures in the area of the former Allston/Brighton toll plaza to allow construction crews to work safely.
The eastbound Exit 18 off-ramps to Allston/Brighton will be closed starting at 11 p.m. today, tomorrow and Thursday.
The on-ramps from Cambridge Street to the Pike west will close at 11 p.m. today.
The on-ramps from Cambridge Street to the Pike east will close starting at 11 p.m. tomorrow, Wednesday and Thursday.
The westbound Exit 20 off-ramp will close at 11 p.m. Wednesday.
In all cases, ramps reopen at 5 a.m.
Signs and message boards will guide drivers through the detours.