Overview
Montauk Highway — New York State Route 27A — is Long Island’s scenic south shore coastal route, running approximately 90 miles from Freeport in Nassau County to Montauk Point at the island’s eastern tip. Carrying roughly 35,000 vehicles per day on average, the number masks an extreme seasonal pattern: winter volumes on the rural eastern sections can be under 5,000 vehicles per day, while summer weekends push the corridor to saturation as city residents flood the Hamptons.
The road follows the south shore of Long Island through a remarkable transition in character. In Nassau County, Montauk Highway runs through the commercial and residential communities of Freeport, Merrick, and Bellmore before crossing into Suffolk County at Lindenhurst. Through western Suffolk it passes the south shore communities of Babylon, Bay Shore, East Islip, and Bayport before reaching Patchogue. East of Patchogue the commercial density drops sharply, and the road transitions through the quieter communities of Mastic Beach, Shirley, and Hampton Bays before entering the Hamptons proper at Westhampton Beach. Through Southampton, Bridgehampton, East Hampton, and Amagansett the road carries its heaviest summer loads before merging with Route 27 for the final stretch to Montauk.
The Hamptons sections of Montauk Highway are among the most socioeconomically significant roads in the United States by destination value — the South Fork of Long Island is home to some of the most expensive real estate in the world, and the highway serves as the primary ground access to these communities for the enormous volume of summer visitors. The conflict between this function and the road’s narrow, village-center routing produces chronic summer congestion and safety problems.
Dangerous Sections
Southampton to East Hampton (two-lane rural sections): The sections of Montauk Highway running through Southampton and East Hampton are the most dangerous by crash severity. The road narrows to two lanes with no center barrier, and the combination of high speeds, impaired drivers on summer nights, and unfamiliar visitors creates a hazardous environment. Head-on collisions are the most lethal crash type.
East Hampton village center: The concentration of pedestrian and bicycle traffic in East Hampton village during summer creates frequent conflicts with through traffic. The village’s historic character limits the road geometry improvements that could otherwise improve safety.
Westhampton Beach approach: The Friday evening westbound backup on this section — as city residents return home — is among the worst recurring traffic events on Long Island, regularly backing up 5–10 miles.
Towns Along This Route
Current Conditions
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Recent Incidents
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Accident Statistics
Montauk Highway crash data show a strong seasonal pattern with summer months accounting for a disproportionate share of crashes and fatalities. DWI crashes spike on summer weekends, especially on Saturday and Sunday nights between 10 PM and 3 AM on the East End sections. Bicycle fatalities on the East End sections are an ongoing concern — the road lacks protected bike infrastructure despite significant cycling activity in the Hamptons communities. The contrast between summer peak season and winter off-season volumes creates a different safety challenge: wintertime crashes on the rural sections are less frequent in number but higher in severity, as higher speeds and lower traffic density encourage risk-taking behaviors on roads that see little enforcement outside summer months.