NV5 - County Road 58 Roundabout

County Road 58 Roundabout

With ever-increasing commercial development making traffic delays worse each year, Suffolk County sought to widen one of the busiest roads on the East End of Long Island — County Road 58 — from 3 to 5 lanes. However, early analyses projected costs that could exceed $40 million, with 2 years of additional time needed for the condemnation process.

NV5 crafted a plan that centered on the development of a 2-lane roundabout at the corridor’s most congested intersection (at CR 58 and CR 73) and successfully designed a narrowed roadway section within a constrained right-of-way.

As a result, $32 million was shaved off the projected price tag. Construction was completed in less than 10 months, on time and on budget. This free-flowing, modern 2-lane roundabout improves traffic operations and reduces air pollution.


Long Island, NY


Suffolk County


Key Facts

2-Lane Roundabout


Diamond Award, American Council of Engineering Companies – New York, 2011