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Speed limits are changing on 9 SLO County roads. Here’s where

Speed limits will descrease on five roads across San Luis Obispo County.
Speed limits will descrease on five roads across San Luis Obispo County. dmiddlecamp@thetribunenews.com

Drivers will have to slow their roll on several local roads after speed limits were reduced in parts of San Luis Obispo County.

Speeding rules will shift on nine streets after the county Board of Supervisors unanimously approved the changes during its Tuesday meeting.

The new speed limits were determined after a series of surveys analyzed roadway conditions across the county, looking at crash reports and the typical speed of traffic.

A “safe and reasonable” speed limit is then created based on or below the rate that 85% of cars drive on the streets, according to the staff report

Supervisor John Peschong said the routine traffic code regulation updates were a good reminder to the public to “slow down.”

The California Highway Patrol will enforce the updated county road speed limits.

Where are speed limits changing in SLO County?

Speed limits are being decreased by 5 mph on five SLO County roads. Here’s where:

  • Los Olivos Avenue in Los Osos will change from 30 mph to 25 mph
  • River Road in San Miguel will drop from 35 mph to 30 mph
  • Black Lake Canyon Drive in Nipomo will be reduced from 35 mph to 30 mph
  • Southland Street in Nipomo will be lowered from 40 mph to 35 mph
  • Halcyon Road in Arroyo Grande will shift from 45 mph to 40 mph

Speed limit designations will be removed from four other county roads, including Stagecoach Road in Arroyo Grande, Sheridan Road in Nipomo, Walnut Avenue in Santa Margarita and Old County Road in Templeton, according to the staff report.

The posted 30 mph speed limit on Stagecoach Road and the 25 mph limit on Sheridan Road will both taken down. Going forward, the roadways will be subject to California’s Basic Speed Law, which requires drivers to never go “faster than is safe for the current road conditions,” according to the Department of Motor Vehicles.

Walnut Avenue and Old Country Road will be redesignated residential roadways with a speed limit of 25 mph.

Wildflowers got an early but sporadic start in California Valley after a dry spell followed early winter rains.
Wildflowers got an early but sporadic start in California Valley after a dry spell followed early winter rains. The display is limited to south and west facing hills, and most of the wildflowers bloomed yellow in the Temblor Range, seen here on Feb. 5, 2026. David Middlecamp dmiddlecamp@thetribunenews.com
Hannah Poukish
The Tribune
Hannah Poukish covers San Luis Obispo County as The Tribune’s government reporter. She previously reported and produced stories for The Sacramento Bee, CNN, Spectrum News and The Mercury News in San Jose. She graduated from Stanford University with a master’s degree in journalism. 
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