Accident risks in collection and transport of hazardous wastes in Finland were studied using statistical data, safety analysis and compatibility charts. The study material comprised stationary collection sites for hazardous waste, campaigns for collection of hazardous waste and hazardous waste treatment and transport contractors. Systematic investigations were made of different working situations and methods and the equipment for hazardous waste collection and transport. Several deficiencies in work safety were found. The largest number of accidents occurred in handling drums and barrels. The parts of the body injured were mostly the eyes, back and feet. Besides the normal loading and unloading hazards, there were others connected with the characteristics of hazardous waste itself, which are most pronounced during waste sorting. Two kinds of hazardous waste compatibility charts were prepared: one for stationary collection sites and the other for special collecting campaigns of hazardous waste. The promotion of the strict use of protective equipment and clothing was recommended.