Roads in Colombia are generally good, although driving in the Andean regions and parts of the rainforest will require a 4-wheel drive. Traffic drives on the right. Speed limits are 45-60kph (28-37mph) in urban areas, and 80kph (50mph) in rural areas. An International Driving Permit is required.
Kidnapping was a real risk when travelling by road in Colombia, but security is improving and travelling by bus is generally safe (especially on the main roads, such as the one linking Bogotá and Cartagena). Driving east of the Andes is not recommended, as incidences of kidnapping and carjacking still occur. It’s best to only drive during daylight hours.