Share taxi vehicles that follow a rough service route, but can go slightly out of their way to pick up and drop off passengers. In many US cities (e.g. Pittsburgh and Detroit), the term "jitney" refers to an unlicensed taxi cab. The name comes from an archaic, colloquial term for a five-cent piece in the US (the nickel). The common fare for the service when it first came into use was five cents, so the "five-cent cab" or "jitney cab" came to be known for the price charged. In Rhode Island a jitney license plate is used for all public passenger buses,
Hybrid taxi hybrids. Clean Air Cab claims to be a carbon-neutral taxi service. In addition to lowering emissions with its hybrid fleet, the company purchases carbon offsets and supports global reforestation by subsidizing the planting of 10 Brazilian rainforest trees monthly for each cab in service. Through an ordinance, the city of San Antonio, Texas introduced a voluntary program in 2007 that allows taxi owners to swap the permit of one non-hybrid car for two permits valid only for hybrid electric vehicles. To prevent one fleet from obtaining all the permits, the largest company is allowed to replace only 1% of its