As the sources of commuting traffic, companies have an important role in the mobility debate. In recent years, they have developed a variety of initiatives to improve the mobility of their employees. Though, their visions and actions are often neglected in the research literature. This paper aims at identifying the "good practices" of mobility policies of workplaces located in Belgium. To achieve this objective, existing researches and two large-scale Belgian surveys of commuting are analysed. First, a classification method is applied to the data in order to identify the workplaces where the alternative modes of transport which are promoted by the policy are popular among employees. Then, quantitative analyses are performed to find out what the good practices of mobility policies are.The results show that the best way of promoting an alternative mode of transport depends on the company's characteristics. The promotion of bicycles suits small workplaces best, while larger workplaces and those located in built-up areas or city centres suit the promotion of public transport best. Financial incentives, provision of facilities, diffusion of information, and parking management play all an important role in mobility management.