Driving on Long Island is a daily challenge. Tight parkway curves, heavy suburban congestion, overly aggressive merging, and outdated road design make Nassau and Suffolk County some of the most accident-prone regions in New York State.

More than 70,000+ crashes occur annually across Nassau and Suffolk, according to New York State DMV Crash Data. Many of these collisions lead to devastating injuries that affect families for years.

To help drivers stay informed — and to protect your rights if you’re ever injured — this guide breaks down the top causes of car accidents on Long Island, supported by real statistics and location-specific crash data.

1. Distracted Driving — The #1 Cause of Crashes in Nassau & Suffolk

Long Island is filled with bumper-to-bumper traffic, making distracted driving especially dangerous. Nationwide, distracted driving caused 3,308 deaths in the most recent reporting year, according to NHTSA.

On Long Island, distractions such as texting, GPS use, and dealing with children in the back seat are especially risky on:

• Southern State Parkway (frequent sudden slowdowns)
• Sunrise Highway
• Route 110
• Hempstead Turnpike

Because almost every road contains multiple signals, shopping centers, school zones, and constant lane shifts, even a 2–3 second glance away can cause a crash.

Why distracted driving legally matters

Texting while driving is illegal statewide. When an at-fault driver was using their phone, it greatly strengthens the victim’s injury claim. Attorneys can subpoena phone records, surveillance video, dashcam footage, and 911 timestamp data.

Learn more about your rights on our Car Accident page.

2. Speeding & Aggressive Driving — Proven to be Deadly on LI Highways

Long Island’s major highways are some of the most dangerous in the state, and speeding plays a major role.

According to New York State DOT, speeding contributes to over one-third of fatal crashes statewide. Several Long Island corridors are statistically confirmed high-risk:

Northern State Parkway

A Newsday analysis found that the Northern State Parkway experiences approximately one crash per 100 vehicles traveling on certain stretches — an astonishing rate given its narrow lanes and tight curves.

Sunken Meadow Parkway / Sagtikos Parkway

An 11.3-mile stretch from West Islip to Kings Park has an average of 1.4 crashes per day.

Other dangerous high-speed roads include:

• Long Island Expressway (I-495)
• Sunrise Highway (Route 27)
• Southern State Parkway
• Meadowbrook Parkway
• Wantagh Parkway

Aggressive driving behaviors commonly linked to crashes:

• Tailgating
• Hard merging
• Weaving across lanes
• Sudden braking
• Road rage incidents

High-speed crashes often result in the most catastrophic injuries — traumatic brain injuries, spinal injuries, and fatal collisions.

3. Dangerous Long Island Intersections — Multiple Have Extremely High Crash Histories

Intersections on Long Island see massive traffic volumes, pedestrian crossings, double-turn lanes, and outdated signal timing — all contributing to high crash rates.

Nassau County’s Most Dangerous Intersections

(Consistently ranked high in county crash data audits)

• Hempstead Turnpike & Wantagh Avenue (Levittown)
• Hempstead Turnpike & Newbridge Road (East Meadow)
• Old Country Road & Mineola Boulevard (Mineola)

These are surrounded by malls, hospitals, and office complexes — meaning thousands of turning vehicles daily.

Suffolk County High-Risk Intersections

• Route 110 & Route 109 (Farmingdale)
• Middle Country Road & Nicolls Road (Centereach)
• Motor Parkway & Commack Road (Commack)

A particularly alarming statistic: Suffolk County had 42,285 crashes in a single year, with 115 fatalities, according to a legal statistical summary sourced from DMV datasets:

Why these intersections are dangerous:

• High pedestrian activity
• Complex multi-lane geometry
• Poor visibility at night
• Rapid signal changes
• High-speed cross traffic

T-bone crashes here are especially deadly, as the side of a vehicle offers little protection.

4. Drunk & Drugged Driving — A Persistent Weekend Threat

Despite awareness campaigns and strict penalties, impaired driving remains a leading cause of fatal collisions across Long Island.

Nightlife areas that see elevated DUI-related crash activity include:

• Patchogue
• Huntington Village
• Garden City
• Rockville Centre
• Farmingdale Main Street

LI Traffic Deaths Have Risen Dramatically

Long Island has seen traffic deaths rise nearly 40% since 2019, with more than 250 deaths in one year across Nassau and Suffolk. This sharp increase is linked partly to alcohol and drug-impaired driving.

Why DUI crashes are so severe

Impaired drivers often:

• Drift into opposite lanes
• Run red lights
• Miss stopped traffic
• Hit pedestrians
• Fail to brake before impact

Victims of drunk driving accidents are generally entitled to enhanced compensation.

Learn more on our Personal Injury page.

5. Weather-Related Crashes — Ice, Hydroplaning & Visibility Problems

Long Island weather can change rapidly, especially near the coasts. Wet pavement, flooding, and snow create hazardous conditions.

According to the Federal Highway Administration:

• 70% of weather-related crashes involve wet pavement
• 46% involve rainfall

LI’s most dangerous weather zones:

• LIE & Northern State overpasses — black ice hotspots
• Montauk Highway — frequent flooding
• Ocean Parkway & Jones Beach Causeway — heavy coastal fog
• Residential roads in Suffolk — unplowed snow accumulation

Weather doesn’t excuse driver negligence. Failing to slow down in dangerous conditions can still make a driver liable.

6. Rear-End Collisions — The Most Frequent Crashes in Both Counties

With dense suburban traffic, school zones, and stoplights every few hundred feet, Long Island sees thousands of rear-end collisions each year.

Common rear-end crash zones:

• Jericho Turnpike
• Hempstead Turnpike
• Middle Country Road
• Route 347
• Ocean Parkway summer traffic

Most are caused by:

• Following too closely
• Distracted driving
• Speeding in slowdowns
• Sudden lane switching
• Failure to see stopped traffic

Rear-end collisions often cause injuries such as whiplash, soft-tissue damage, back and neck injuries, and concussions — even at low speeds.

Who is usually at fault?

The rear driver is typically presumed liable.
However, insurers often argue that the front driver “stopped short.” This is a tactic our firm regularly defeats by using traffic cams, vehicle black box data, and witness statements.

7. Failure to Yield — Especially During Left Turns & Highway Merges

Failure to yield is one of the most common causes of Long Island collisions, particularly at left-turn intersections and highway on-ramps.

High-risk left-turn roads:

• Jericho Turnpike
• Middle Country Road
• Route 347
• Nicholls Road
• Sunrise Highway feeder lanes

Highway ramp dangers:

Many on-ramps on the Southern, Northern, Meadowbrook, and Wantagh Parkways require merging at the exact moment traffic is flying by at 60+ mph.

Who is at fault?

The turning or merging driver is often presumed negligent unless the other driver:

• Was speeding
• Ran a light
• Was distracted
• Made an illegal maneuver

Surveillance footage from gas stations, shopping centers, and red-light cameras is often crucial — and can disappear quickly. Time is critical.

What To Do After a Car Accident on Long Island

If you’re involved in a crash in Nassau or Suffolk, here’s what to do immediately:

1. Call 911

A police report is essential for your claim.

2. Photograph the scene

Capture damage, conditions, vehicles, injuries, and traffic controls.

3. Seek immediate medical care

Some injuries appear hours or days later.

4. Don’t speak with insurance adjusters

They aim to minimize your payout.

5. Contact a Long Island car accident attorney

Preserving evidence early is critical — many cameras overwrite footage within 24–72 hours.

Speak With a Long Island Car Accident Lawyer Today

If you or a loved one was injured in a crash anywhere in Nassau or Suffolk County, you deserve an advocate who understands Long Island’s roadways, traffic patterns, and insurance tactics.

• Free consultations
• No fees unless we win
• Aggressive insurance negotiation
• Decades of combined experience

Contact us today:
The Fastman Law Group – Car Accident Attorneys

Or call (516) 437-7300

Trusted Long Island car accident lawyer serving Nassau and Suffolk residents.