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Temporary Closure Scheduled on Interstate 190 in Rapid City

At 5 a.m. (MT) on Saturday, June 21, 2025, the final temporary closure on Interstate 190 and exit 57 in Rapid City is scheduled to take place. Both I-190 and exit 57 are scheduled to reopen on Sunday, June 22, 2025, at 8 p.m. (MT). Read More

Interstate 90 Lane Closures and Traffic Diversions Planned at Brandon

Beginning at 7 p.m. on Wednesday, June 25, 2025, the eastbound and westbound lanes on Interstate 90 at exit 406 (Brandon) will be temporarily closed for crews to set bridge girders. Read More

SDDOT Seeks Public Input for the Bryant Master Transportation Plan Study

The South Dakota Department of Transportation (SDDOT), in collaboration with the City of Bryant, will hold a public meeting open house on Tuesday, June 24, 2025, from 5:30 to 7 p.m. at Bryant City Center, located at 115 E. Main St. in Bryant. Read More

Milling Work Scheduled to Begin on U.S. Highway 385 North of Sheridan Lake Road Near Hill City

During the week of Monday, June 16, 2025, construction crews will begin milling operations on U.S. Highway 385 from approximately one-half mile north of Sheridan Lake Road to Wrinkle Valley Road. Read More

Traffic Switch Planned on Northbound I-29 in Sioux Falls as On-Ramp Reopens at 26th Street

On Monday, June 16, 2025, the northbound Interstate 29 on-ramp at 26th Street will be reopened. As structure work continues, northbound traffic on I-29 over the Skunk Creek Bridge will be switched and maintained in the two east lanes. Read More

Pavement Restoration Project to Begin in Lead, Deadwood, and Rapid City

Pavement Restoration Project to Begin in Lead, Deadwood, and Rapid City Read More

SDDOT Seeks Public Input for Environmental Assessment for I-90 (Exits 61-67) Near Box Elder

The South Dakota Department of Transportation (SDDOT), in collaboration with the Federal Highway Administration (FHWA), will hold an in-person public meeting open house on Wednesday, June 18, 2025, from 5-7 p.m. (MT). Read More

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On June 26, 2025, the Transportation Commission will consider amendments to Administrative Rule of South Dakota 70:01:02:03 – Brown County speed zone rule. https://rules.sd.gov/agency.aspx?agency=DOT%20%20Department%20of%20Transportation

Rules adopted by the South Dakota Aeronautics Commission on June 12, 2025, concerning ARSD Chapter 70:02:04 – Airport Licensing, will be considered by the Interim Rules Review Committee on July 15, 2025. More information may be obtained at: https://rules.sd.gov/agency.aspx?agency=DOT%20%20Department%20of%20Transportation

2025-2028 Statewide Transportation Improvement Program (STIP)
Learn about the South Dakota EV Fast Charging Plan
Highway Needs and Project Analysis Report (Needs Book) 2022 - Interactive Map - (under pavement management products)

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Updated Move Over Law in South Dakota

South Dakota’s updated Move Over Law became effective as of Tuesday, July 1, 2025. The updated law now applies to all vehicles occupying the shoulder using amber, yellow, or blue warning lights. Read More

Diverging Diamond Interchange

The LaCrosse Street Diverging Diamond Interchange (DDI) in Rapid City and the 41st Street DDI in Sioux Falls were designed to enhance safety and address future travel needs in high volume intersections within two communities experiencing population growth. The DDI design improves safety by reducing vehicle conflict points. Read More

Make our Roads Safer: We challenge you. Buckle Up, Phone Down!

South Dakota is one of 28 states that participate in the Buckle Up Phone Down (BUPD) safety campaign. The Buckle Up Phone Down challenge is simple: when you get into any vehicle, buckle up your seatbelt. If you are a driver, put the cell phone down. Turn it off if you have to. Every trip, every time! Read More

2024 South Dakota Strategic Highway Safety Plan (SHSP)

The 2024 South Dakota Strategic Highway Safety Plan (SHSP) details a vision for highway safety in South Dakota and outlines interim objectives to progress toward a safer transportation system. Throughout the Plan, there are many informative graphics that help illustrate the importance of highway safety. Read More