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2024 South Dakota Winter/Spring Frost Law Restrictions

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2024 South Dakota Winter Frost/Spring Thaw Laws and Seasonal Weight Restrictions

The imposition of spring load restrictions in South Dakota, as of the latest report, is a response to the dynamic conditions of weather and road surfaces. These restrictions are strategically implemented to mitigate potential damage during the freeze/thaw period, ensuring the structural integrity of the roads. The specified load restrictions vary across different highways and regions, encompassing factors such as axle weight and tonnage limits. For instance, on SD 251 from the Nebraska State Line to US 18, a 6-ton per axle restriction is imposed from February to April. Similarly, on SD 1804 and SD 1806, restrictions of 6 tons per axle were effective during the same period, emphasizing the importance of tailored restrictions based on road characteristics.

South Dakota Overweight Restrictions

Notably, the restrictions are different, with changes in tonnage limits, effective dates, and regions. For instance, on March 7, 2022, on SD 1806 from Jct. SD 273 north to US 83, a 6-ton per axle restriction was in place until April 5, 2022.m It’s essential to highlight that these restrictions are subject to updates, and a spring load restriction report is typically issued in advance, offering guidance without superseding the importance of on-site load restriction signs. This proactive approach is crucial for ensuring road safety, preventing undue stress on road structures, and maintaining a balance between transportation needs and infrastructure preservation.

South Dakota Oversized Load Signs and Travel Times

Operating hours for oversized loads are restricted to one-half hour before sunrise after sunset, with flexibility for continuous movement on interstate highways for loads not exceeding 10 feet in width, 14 feet 6 inches in height, and 110 feet in overall length. However, loads that are solely overweight may operate 24/7. In compliance with oversized load regulations, vehicles issued an oversized permit must display warning signs if they exceed 95 feet in length or 12 feet in width or operate during nighttime hours. Nighttime operation necessitates the use of reflectorized or lighted signs. Acceptable text for signs includes “OVERSIZE LOAD,” “OVERSIZED LOAD,” “WIDE LOAD,” and “LONG LOAD.” These signs, measuring at least 18 inches in height by 84 inches in width, must be legible at a distance of 500 feet. Letters should be 10 inches high with a 1 3/8-inch brushstroke against a yellow background. One sign must be visible to oncoming traffic on the front of the vehicle, and another must be mounted on the rear for traffic approaching from behind.


See also:

Tire chain laws.
Federal bridge formula.