How is the CO make calculated from the given roadway dimensions and velocity?

The CO make, or carbon monoxide emissions, can be calculated using the formula that considers the roadway dimensions and vehicle velocity. The correct choice highlights the key variables involved in this calculation: roadway height, width, and velocity.

When determining the quantity of CO emissions produced, multiplying the height of the roadway by its width provides the area through which vehicles are moving. This area is essential as it influences how many vehicles can travel in a given roadway space and subsequently affects the total emissions generated. The velocity factor is crucial as it indicates how quickly vehicles are moving through that area; faster speeds typically result in higher emissions due to greater fuel consumption.

Thus, by multiplying the roadway height, width, and velocity, you can effectively calculate the total emissions of carbon monoxide. This approach encapsulates the interaction between roadway dimensions and vehicle movement, leading to an accurate estimation of CO emissions in a specific context.