C-470 & Quincy Roundabouts

Traffic Impacts - March 30 to April 5

Ongoing Traffic Impacts

• Intermittent lane closures will be taken during working hours, Monday to Friday
• Traffic at the new roundabout is in its permanent configuration
• This permanent configuration consists of two lanes in each direction - a single lane in the roundabout and a single bypass lane
• Working hours are 7 a.m. to 6 p.m. Monday to Friday, except on holidays
• Some Saturday work can be expected
• The speed limit has been restored to 35 mph
• No width restrictions are in place
• Signs and devices are present to maintain safety
• Please exercise caution and obey posted speed limits and signs
• The project limits on W. Quincy Ave. extend from Mile Point 0 to MP .56
• Construction schedules are weather dependent and subject to change

• Intermittent lane closures will be in place during working hours, Monday to Friday
• Working hours are 7 a.m. to 6 p.m. Monday to Friday, except on holidays
• Three-way stop signs are present
• The project limits at this location extend from Mile Point 0 to MP .225
• The speed limit has been restored to 35 mph
• No width restrictions are in place
• Please exercise caution and obey posted speed limits and signs
• Signs and construction devices are in place to alert motorists to traffic shifts, reduced lanes and work zone restrictions
• Construction schedules are weather dependent and subject to change

Work Zone Safety Alert

• Please drive slowly and exercise caution within the project limits as conditions are changeable and construction crews, pedestrians and cyclists may be present
• Adjust your speed to avoid sudden reactions
• The roundabout is in its permanent configuration
• Stop signs exist within the work zone to manage traffic flows and maintain safety for the traveling public, the construction crews and the surrounding community
• Please obey speed limit and traffic signs and exercise caution
• Message boards, signs and construction devices are present to alert the public to the work zone, closures and restrictions

General Impacts, Schedule & Scope of Work

• The project began in May 2024 with a duration of up to 18 months
• The project entered a winter hiatus on Dec. 21, 2024 and returned on Feb. 18, 2025
• Work includes adding a single lane roundabout with bypass lanes at the Quincy and C-470 northbound ramp intersection, and a T-intersection with traffic signal at the Quincy and C-470 southbound ramp intersection
• Other work includes adding capacity, building retaining walls, installing signs, and making drainage improvements
• Periodic on and off ramp closures to and from C-470 at Quincy Ave will be taken during off-peak daytime as well as overnight hours
• Some closures of half the existing Quincy Ave over C-470 bridge will be taken for roundabout and other construction, with two-way traffic maintained and 12-ft width restriction in place
• A single lane closure on northbound C-470 will exist later in the project for sign work
• No work will take place on mainline C-470
• Normal working hours will be from 7 a.m. to 6 p.m. Monday to Friday
• The project limits on C-470 extend from MP 6.10 to MP 6.80
• The project limits on Quincy extend from MP 0 to MP .56
• Signs and construction devices will be present to alert the public to the work zone, closures and restrictions
• Construction schedules are weather dependent and subject to change
• Please refer to COtrip.org for real-time travel conditions and to plan your trips!