Officials experimented last month with an odd-even license plate scheme that intended to remove half of the motorized vehicle fleet from the roads each day. Odd and even plate numbers alternated the days on which cars could be used. The program did include a long list of exemptions that could have nullified any vehicle reductions: women were exempted so they could avoid possible violence and harassment on public transport, Likewise, additional exemptions were granted to senior government officials, motorcycles, disabled drivers, emergency services, and vehicles using natural gas. Despite these exemptions the Delhi experiment did appear to reduce congestion at certain times. Due to lingering exhaust fumes and pollution from other sources, the air quality did not markedly improve during the test period, which concluded on 15 January. With the conclusion of the 15-day trial scheme, officials will assess whether or not to take the program forward...

— blogs.adb.org/blog