Transport infrastructure within Chad is generally poor, especially in the north and east of the country. River transportation is limited to the south-west corner. As of 2011 Chad had no railways though two lines are planned - from the capital to the Sudanese and Cameroonian borders during the wet season, especially in the southern half of the country. In the north, roads are merely tracks across the desert and land mines continue to present a danger. Draft animals (horses, donkeys and camels) remain important in much of the country. There are no trains in Chad, so the most convenient way to get around N’Djamena is by minibus. These minibuses operate throughout the capital. Buses rarely leave on scheduled intervals, so the fastest way to get around is by taking a land cruiser, which picks up and drops off passengers along the way. Travel times may vary because of road conditions and the weather, especially during the rainy season where mud is common. In other cities, fleets of motorcycle taxis or clandos are common. Like taxis and minibuses, they charge a fixed fare if you are just going around the city.