This paper discusses the impact of the existing truck ban on Metro Manila's urban transport system and evaluates the effectiveness of the truck ban by comparing traffic patterns in the form of loaded traffic flows in the road network for different truck ban schemes. Five schemes are examined, namely; existing truck ban, without truck ban, peak-hour truck ban only, all-day truck ban at the primary road, and all day truck ban at the primary road and other major arteries. The paper also estimates the vehicle emissions of each alternative truck ban scheme and compares them with the existing truck ban measure. General findings indicate that additional restrictions significantly increase total vehicle-kilometers, total vehicle-hours, and total pollutant emissions.