Downtown rush hour has still not roared back to pre-pandemic levels even as car travel surges in the suburbs, a new study finds — and it may help explain why traffic deaths have stayed so stubbornly high in U.S. communities.
And as the bike shortages of the Covid-19 pandemic recently revealed, the absence of a robust domestic bike industry can itself become a barrier to getting Americans riding.
Federal and state agencies may be underestimating the amount of dangerous ammonia emissions that cars pump into the atmosphere by as much as a factor of five, a new study finds — and maybe more in urban areas.