Transport economics in perspective highlights the critical role of infrastructure investment in the United States. The U.S. transportation system, which includes roads, bridges, airports, and public transit, is a cornerstone of the nation's economic growth and development. Infrastructure investment is essential for maintaining and improving the efficiency, safety, and sustainability of the transportation network.

According to the American Society of Civil Engineers (ASCE), the U.S. needs to invest approximately $2.6 trillion in infrastructure over the next decade to meet current and future needs. The ASCE's 2019 Infrastructure Report Card gave the nation's infrastructure a D+ grade, indicating a significant need for investment. This investment is crucial for several reasons.

Firstly, infrastructure investment stimulates economic growth. The construction and maintenance of transportation infrastructure create jobs and generate economic activity. For instance, the U.S. Department of Transportation estimates that every $1 billion invested in transportation infrastructure supports approximately 35,000 jobs. This economic multiplier effect is vital for reducing unemployment and improving the overall economic well-being of the nation.

Secondly, infrastructure investment enhances safety and reduces congestion. Upgrading and expanding transportation networks can lead to fewer accidents and shorter travel times, which in turn improves the quality of life for Americans. According to the National Highway Traffic Safety Administration (NHTSA), approximately 36,560 people were killed in motor vehicle traffic crashes in 2019. Investing in infrastructure can help reduce these fatalities and injuries.

Lastly, infrastructure investment is essential for environmental sustainability. As the transportation sector accounts for a significant portion of greenhouse gas emissions, investing in public transit, electric vehicles, and other sustainable transportation options can help reduce the nation's carbon footprint. The U.S. Environmental Protection Agency (EPA) reports that transportation accounted for 29% of total U.S. greenhouse gas emissions in 2019. By investing in sustainable transportation, the U.S. can work towards meeting its climate goals and reducing its environmental impact.

In conclusion, transport economics in perspective underscores the importance of infrastructure investment in the United States. This investment is crucial for economic growth, safety, and environmental sustainability. The data from various sources, such as the ASCE, NHTSA, and EPA, support the need for increased investment in the nation's transportation infrastructure.