Cos Cob, a neighborhood within Greenwich, has several busy roads that are prone to serious accidents. With major highways, local cut-through routes, and high pedestrian and cyclist activity, Cos Cob’s roadways pose risks for motorists and vulnerable road users alike. Based on crash data, police reports, and local news coverage, the most dangerous roadways in Cos Cob include I-95, U.S. Route 1 (East Putnam Avenue), and Valley Road.
Major Routes with High Crash Rates
- Interstate 95 (I-95)
The stretch of I-95 that runs through Greenwich, including Cos Cob, is one of the busiest in Connecticut and a frequent site of crashes. - Cut-through traffic – Drivers often use local roads in Cos Cob to bypass I-95 congestion, increasing risks on residential streets.
- Construction zone hazards – In one tragic incident, a construction worker was killed on I-95 near the Exit 3 interchange, underscoring the dangers of highway work zones.
- U.S. Route 1 (East Putnam Avenue)
This major artery is heavily trafficked and especially dangerous for pedestrians. In February 2020, a crash at this corridor resulted in a fatality when a car collided with a building. Inadequate walking infrastructure continues to make this roadway one of the riskiest in town. - Valley Road
Valley Road has been identified as a particularly hazardous road due to speeding, heavy traffic, and poor design. Many commuters use it as a cut-through to avoid congestion on other roads.
In 2024, officials proposed a four-way stop at the intersection of Valley Road, River Road Extension, and Scofield Street after multiple crashes involving bicycles and pedestrians.
Notorious Intersections
- Sachem/Indian Field/Strickland at Bruce Park access – Dangerous for cyclists and pedestrians due to high vehicle volumes and limited sidewalks.
- Valley Road and River Road Extension/Scofield Street – An offset intersection with a troubling crash record: at least 21 crashes between 2016 and 2024, many involving cyclists and pedestrians.
- Putnam Avenue and Cross Lane – The site of a 2020 fatal crash when a car collided with a building.
- Putnam Avenue and East Weaver Street – In August 2025, a motorcyclist and passenger were injured in a crash near the Mobil gas station here.
Factors Contributing to Accidents
- High traffic volume and congestion – Both I-95 and East Putnam Avenue experience heavy traffic that leads to frequent collisions.
- Pedestrian and cyclist hazards – Lack of sidewalks and safe crossings increases risks for vulnerable road users.
- Speeding – Reckless driving and excessive speed are cited in many Cos Cob accidents.
- Confusing road design – Complex intersections and highway off-ramps add to driver confusion, resulting in frequent crashes.
Stay Alert, Stay Safe
Cos Cob’s roadways—particularly I-95, East Putnam Avenue, and Valley Road—require extra caution from drivers, cyclists, and pedestrians. Staying alert, slowing down, and respecting traffic signals are essential for reducing the risk of serious accidents in this busy part of Greenwich.
Protect Yourself
If you or a loved one has been injured in a crash in Cos Cob, you may be entitled to compensation for medical bills, lost wages, and other damages. The experienced attorneys at Hastings, Cohan & Walsh, LLP (HCW, LLP) are here to help protect your rights.
Call us today at (203) 438-7450 for a free consultation or visit catherinev2.sg-host.com to learn more about protecting your case.