The northbound entrance to Dublin's roundabout at West Dublin Granville Road and Riverside Drive has had the highest crash frequency, according to City Manager Dana McDaniel.
So the city plans to modify those northbound lanes.
Details of the improvements -- estimated to cost $260,000 -- were included in McDaniel's July 27 memo to Dublin City Council.
The roundabout opened in August 2016 and was fully functional in November 2016. During that time, the new infrastructure generated numerous comments from the community, both for and against the development.
Dublin officials in February announced the city had secured a $29,046 contract with Wisconsin firm MTJ Engineering to study the roundabout's design, signs and yield area.
According to McDaniel's memo, 58 percent of the total number of crashes at the roundabout have occurred at the northbound approach.
The improvements include pavement marking and sign revisions, modification of the central island and resurfacing. The project will be funded from remaining bond proceeds that were reserved for the project and other Bridge Street District roadways, according to the memo.
The existing lanes in the northbound approach from Riverside Drive (U.S. Route 33) will be updated to better distribute traffic flow.
Under the changes:
* The left-only lane on the left will become a shared through and left-turn lane around the roundabout to East Bridge Street west.
* The middle lane has been a shared through and left-turn lane but will become a through lane only, continuing north on Riverside.
* The shared through and right lane on the right will become a right-only lane to West Dublin Granville Road east (state Route 161).
Public-works director Megan O'Callaghan said she expects that work to begin in a couple months and conclude by the end of the year.
The construction schedule and any related traffic effects have not been defined yet, said senior public-information officer Lindsay Weisenauer.
Council member Michael Keenan expressed support for the project and said northbound improvements make sense.
Council member Chris Amorose Groomes urged city staff members to develop solutions to roadways using traffic projections rather than current traffic statistics to provide a long-term vision.