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Posted on: September 30, 2021

Medians, landscaping sight lines designed for 25-mph speed limit on Jackson Boulevard

City of Spearfish

Residents reminded to observe the speed limit

SPEARFISH, SD – The addition of the medians on Jackson Boulevard was in part for safety, creating traffic calming measures meant to slow vehicles traveling down the wide roadway. With that, they also provided the opportunity for “streetscaping” for aesthetics/beautification rather than bare concrete medians.

The vegetation within the center medians has grown over the season, and many residents have posed questions related to the landscaping on these medians and sight lines from the intersections.

Assistant Public Works Director Adam McMahon explained that the project was designed to ensure the landscaping and plantings were located outside of a vehicle’s sight triangles (per Federal Highway Administration (FHWA) guidelines), based on a speed limit of 25 mph, which is the posted speed limit on Jackson Boulevard. McMahon has visited the medians several times to confirm the location of the landscaping and plantings and found that even with their growth (which was anticipated), they are located as per the plans and design and outside of a vehicle’s sight triangles.

“If traffic is traveling faster than the speed limit on Jackson Boulevard, then the sight triangles from 10th Street start becoming less than desired,” he said, reminding motorists to observe the speed limit on all roadways. “The traffic layout on Jackson Boulevard with the medians, narrower lanes, landscaping, and other items were designed to slow traffic down to the speed limit.”

There is currently a speed radar sign for westbound traffic coming off of Exit 12 so motorists can see their speed of travel along Jackson Boulevard, and the City intends to add another speed radar sign for eastbound traffic.

The overall contract completion date for the overall Jackson Boulevard project is Nov.15, 2021.

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