Polluted, bike-hostile Brussels to slam on the brakes with 30 km/h limit In Brussels, acknowledging climate concerns, local authorities have decided to reduce the speed limit to 30 kilometers per hour by 2021, a measure to encourage "clean" travel, on two wheels or on foot. The Belgian city is following in the footsteps of Berlin and Madrid, but road-users are not convinced that the measure will make any real difference. IMAGES AND SOUNDBITES