One accident sent one man to the hospital with minor injuries.
It happened just after 5 p.m. on highway 75, just south of the Topeka city limits.
The highway patrol says 63-year old Melvin Keller of Meriden was northbound, he missed a curve, went through the median across the southbound lanes of traffic, then into the ditch.
No other vehicles were hit.
Authorities are investigating whether alcohol was involved in the accident.