No, but like roads, public transit leads to greater economic activity and boosts GDP. Good public transit also increases social and financial mobility, makes other clean air targets easier to hit, and decreases medical costs [0] while increasing the number of financially-productive hours a citizen can work - because a healthier citizen is a more economically productive one.
America seems utterly incapable of grasping many second-order effects. For another example, look to the ROI of investing in the (coninuously underfunded) IRS [1]
[0] https://pmc.ncbi.nlm.nih.gov/articles/PMC4917017/
[1] https://www.businessinsider.com/irs-tax-audits-recover-12-do...