There are many approaches to reducing emissions from transportation, including:

• Reducing trips made in motor vehicles by telecommuting, carpooling, or by using an alternative mode of transport such as public transit or bicycling.
• Switching from conventional vehicles to electric or hybrid vehicles.
• Reducing traffic congestion
• Reducing vehicle idling and practicing eco-driving
• High occupancy vehicle lanes
• Improving traffic signal timing

…and there are many more.

This website has two tools to help practitioners and the public understand the impacts of various transportation emissions reduction strategies:

• An interactive calculator to evaluate the emissions associated with your personal travel.
• A tool for planning professionals that can help evaluate the impact of implementing various strategies.