The government is under intense pressure to unravel the whereabouts of six Kenyans allegedly abducted during Christmas.
Ruto admitted to government excesses during his New Year's address, promising action.
The return trips are set to ease the travel of Kenyans returning to the capital city ahead of school reopening.
Motorists have raised alarm over the blatant corruption on the roads.
Traders are counting losses over the products that have been stuck for a month.
The fighting could slow the processing of land issues within the two counties.
The AUC chairpersonship election will take place during the 38th AU Summit in Addis Ababa in February.
According to witnesses, the vehicle was descending down the road with occupants being ejected.
The body is asking Kenyans to assist in the arrest of the blogger.
This comes even as leaders call for unity amid fractions among the political class.