In fact, the large numbers of motorcycles has become a new business since the past 5 years. Since there are a lot of motorcycles, their owners have started to offer transporting people from one place to other as if they were taxis. This caused a lot of friction between taxis and "mototaxis", as many people call them, because it has reduced the demand of people willing to pay for the cost of a taxi. Another method of transportation that is very common, but mostly used as attractive complement to the colonial architecture, are the white carriages which tourists can pay for to have a tour of the city. The city recently began municipal bus service under the name TUPAL that utilize natural gas powered buses.