Buses and minibuses operate on the main routes linking Dakar to other principal cities and towns in Senegal. The most common form of transportation is the car rapide - colourfully painted vehicles that are often very crowded and sometimes unsafe. The bus system is fairly reliable, however there are no system maps so travellers are left to figure the routes out on their own. Taxis are also available and it is best to negotiate the fare before leaving; foreigners are often charged exorbitant rates, so it is best to consult a local for an estimated fare. Car rental agencies operate from Dakar, but rates are often very high.