South Dakota Road Laws
Generally South Dakota traffic laws follow the US Uniform Traffic Code.
For instance, right turns on red are permitted unless otherwise
75 mph. Speeds are posted lower around Rapid City, Sioux Falls and
Sioux City however. Other Highways: Maximum 65 mph unless otherwise
Speed limits on most of the scenic roads in the Black Hills are 45 mph
or slower. Curves may be posted as little as 15 mph. City Streets: 25
unless otherwise posted.
Drivers and front seat
must use seatbelts. However vehicles cannot be stopped for seatbelt
alone. A child restraint system (infant seat) is required for children
under the age of 5.
A vehicle can be stopped if a child is not properly restrained.
Must be used between
after sunset and 1/2-hour before sunrise and at other times when
for safe driving.
Helmets are not required
for adults; however all persons under the age of 18 must wear approved
helmets. Eye protection or windshield is required. Rear view mirror
Handle bars may not be no more than shoulder high. Riders must have a
Operators with a blood
level of 0.10 percent or higher must not operate a vehicle. Implied
for breathalizer and/or blood tests. Legal drinking age for all
beverages is 21. (DWI, Driving While Intoxicated; DUI, Driving Under
Bicycles may be ridden on
any roadway in South Dakota except in areas where they are specifically
forbidden. Bicyclists must obey all traffic laws. (Note: Bicycles may
portions of the South Dakota Interstate Highway System.)
of less than 50cc may be operated on city streets by licensed vehicle
operators without a special motorcycle endorsement.
Cell Phone Usage:
Several South Dakota municipalities, notably Sioux Falls, have
ordinances against texting and "hands-on" cell phone usage by vehicle
South Dakota registered and licensed ATVs may be used on most roads
except the Interstate Highway system. ATVs must be at least 250cc or
larger and have a horn and mirror to be road legal. ATVs road
licensed in other states may be used on South Dakota roads. Helmets are
not required for ATV use except for persons under the age of 18,
however eye protection or a windshield is required for on-road usage.
All ATVs, UTVs and other motorized off-road vehicles
used in the Black Hills National Forest must also have a USFS use
permit sticker to operate on the Black Hills National Forest trail system.