State Route 99 Voted ‘Most Dangerous U.S. Road’
State Route 99 (SR-99) in California has been identified as the most dangerous road in the United States, with statistics showing that for every 100 miles, 34 lives are lost. Authorities are urging drivers to take extra caution when traveling on SR-99 and are introducing new safety measures to address the risks.

Driving Challenges
SR-99 stretches about 400 miles and presents significant driving challenges, particularly for inexperienced drivers. As much of the road passes through rural areas, the monotony of the scenery can lead to driver distraction.
According to the California Highway Patrol, speeding is one of the main causes of accidents on SR-99. Many younger drivers admit to taking risks such as exceeding speed limits, which increases accident risk. Although the posted speed limit is 70 mph, drivers are encouraged to adjust their speed to match conditions and their own comfort level.
Safety Improvements
Several projects are underway to improve safety along SR-99. For example, work began to widen sections of the road, such as the stretch between SR-99 and SR-120 in the Madera area, expanding it from four to six lanes to improve traffic flow.
In Seattle, the SR-99 tunnel is implementing a tolling system intended primarily to cover construction and maintenance costs, but it is also expected to reduce congestion — a factor that can indirectly lower accident rates.
Reducing Risks
While SR-99 has a reputation for being a high-accident corridor, many of the causes — such as speeding, distraction, and unsafe driving behaviors — are preventable. By following traffic laws, maintaining safe speeds, and staying alert, drivers can significantly reduce their risk. Continued infrastructure upgrades and enforcement efforts are also expected to contribute to improved safety.
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