Safety

• Risk factors
• Exposure by type of safety risk
• Precursor events (close calls) for most forms of surface transportation
• Disabilities and medical costs related to transportation injuries

• Effective reduction of trans- portation-related casualties and property loss depends on
  detailed understanding of safety risks and causes of safety incidents
• Measures of safety program effectiveness guide public investments and regulations

Energy consumption, green house gasses, air quality

• In-use fuel economy and emissions
• Amount of vehicle travel by type of vehicle and vehicle speed in each air shed

• Estimates of air quality issues are based primarily on laboratory conditions and assumed operating patterns and should be tested against actual operat- ing conditions

Noise, water quality, habitat dislocation

• National and regional invento- ries of noise exposure from all modes
• Natural habitat disruption

• Geographic distributions of noise exposure and habitat disruption identify mitigation investment needs and target mitigation measures

Community disruption

• Social and economic connections among neighborhoods

• Improve planning to avoid or mitigate community disruption from transportation facilities and to provide physical connections between mobility-challenged citizens and services and employment opportunities