Rotary Retrofit

The rotary retrofit concept would include striping to create two lanes within the rotary as well as bike and pedestrian accommodations.

At two sessions Thursday, December 5, at the Mashpee Public Library, the Cape Cod Commission presented an array of conceptual redesigns of the Mashpee rotary aimed at improving safety, reducing congestion, and improving pedestrian and bike accommodations.

The concepts presented for feedback from residents included retrofitting the rotary, shrinking the rotary to a smaller roundabout, creating a Route 28 overpass above the rotary, and multiple designs which would replace the rotary with a four-way intersection with a traffic light.

“Everything you see here today is a feasible alternative,” said Steven Tupper, a transportation program manager with the commission, noting that none of the presented concepts would make traffic or safety worse.

The rotary retrofit was by far the most popular design when a straw poll was held during the first of the two sessions held Thursday.

The retrofit would maintain the five approach roadways and would add lane lines, crosswalks and multi-use paths for bikes and pedestrians. The retrofit rotary would operate as two lanes to help improve congestion.

The retrofit rotary would be the shortest term and cheapest project of the concepts presented, according to the commission’s presentation.

A few members of the public, however, raised their hands during the straw poll in support of the roundabout concept.

Being a smaller circle, the two-lane roundabout would slow traffic entering from the five approaches. It would improve safety and congestion but would impact nearby properties as Route 151 would have to be reformatted.

The roundabout concept would also include bike and pedestrian accommodations.

A Route 28 bypass bridge arching over rotary would be the most expensive of the three concepts which maintain a rotational design, said Colleen Medeiros, a transport engineer with the commission.

The bypass would impact nearby properties since Route 28 would have to widen to create the bypass. Bike and pedestrian accommodations were not included in the concept.

Three traffic signal options were also presented. Each traffic signal option involved shrinking the intersection to a four-way intersection.

One option would connect Route 151 to Route 28 before entering the intersection, another would dead-end Great Neck Road South before the rotary requiring drivers to connect to Route 28 via Donna’s Lane, and the final option would connect Great Neck Road South to Route 28 before the traffic signal.

All of the traffic signal designs would be expensive, long-term projects with major impacts on surrounding properties due to the redesign of roads. The traffic light options would improve congestion but less so than other concepts, according to the presentation.

A five-way intersection would not improve congestion, Ms. Medeiros said.

The session by the commission served as an early planning stage meant to solicit feedback from the community “to see if any of these [concepts] are worthwhile to move forward,” Mr. Tupper said.

“MassDOT does not like to spend significant design money on projects that aren’t wanted by the community,” he said.

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