Several forms of public transport are popular in Oman. Most popular are the "Baiza" buses, so named for the lower denomination of the Omani rial, the baiza (an adaptation of the Indian lower denomination paisa). These are relatively inexpensive and service all major roadways, as well as a wide and loose network of smaller byways in the greater Muscat metropolitan area, opportunistically dropping off and picking up passengers at any location. Less popular and slightly more expensive are large public buses, coloured red and green, whose service is limited to major roadways and point-to-point travel routes between Oman's major cities and towns. Taxis, also colour-coded orange and white, provide semi-personal transportation in the form of both individual hire and the same opportunistic roadway service as Baiza buses.