Global warming experienced on the earth in the last few decades has been attributed to greenhouse effect caused by accelerated CO2 emissions from the burning of fossil fuels. This study determined and described the effectiveness of transport policies on emission of CO2 from motorized road transport system in Kisumu City using stakeholder and document analyses. The theoretical framework of this study was the Systems Theory and the Clean Development Mechanism. The study recommended that the government should invest heavily in the public transport sector by enacting laws and policies aimed at discouraging the importation and use of low seating capacity vehicles and invest in the high seating capacity vehicles (BRT) and non-motorized road transport.