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The project is expected to take about two months to complete.
Church Road was closed for a period of time as local officials investigated the crash.
The lane reduction will allow crews to prepare for a culvert repair project at the bridge.
Residents are being asked to use Main Street as a detour route.
The new James Street Bridge is expected to be open by early summer.
Construction equipment in the area will cause crews to close the trail between Pine Street and the State Street roundabout the week of Feb. 10.
The roads have since reopened in the area of the incident.
The speed limit decrease will take effect on the 2.5 mile stretch of I-5 after the crews finish installing new signs on Wednesday.
At this time, there is no estimate of when both lanes will reopen.
Crews are working to finish installing lights at the intersection following the roundabout’s completion in August.