While not an officially organized Car-Free Day, every year traffic in Israel stops (except for emergency vehicles) for more than 24 hours in observance of Yom Kippur. This encompasses all motorized vehicles, including cars and public transportation (buses, trains, taxis, airplanes etc.). Cycling enthusiasts of the Hiloni stream and other religions take advantage of this, and roads (except in religious neighborhoods) become de facto esplanade and cycleways. Air pollution in Israel that day, measured by nitrogen oxides, dropped by 99 percent.