A search at the NTSA web portal identified the owner of the vehicle as Kapseret MP Oscar Sudi.
The man identified as David Lemayian was seen standing in front of a black Mercedes as he sought to prevent the sleek car from being driven on the wrong side of the road.
In the video shared by activist Boniface Mwangi, Lemayian appears to be lecturing the car's occupants on traffic rules while pointing at other motorists who were waiting for clearance.
The vehicle was being driven by a youthful driver wearing a cap.
A search at the National Transport and Safety Authority web portal identified the owner of the vehicle as Kapseret MP Oscar Sudi.
Social media was full of praise for Lemayian's brave act while at the same time calling on the legislator to adhere to traffic rules.