The devices would use GPS technology or cameras to verify the speed limit in a particular area and slow a speeding vehicle down if it approaches 10 mph over the limit. Wiener said he is open to changes in the bill — for example, whether to require active or passive speed governors. The European Union passed legislation that will require passive speed governors in all cars sold in member countries starting in July. The legislation is likely to be met with some opposition from certain trucking groups that have similarly opposed federal legislation regarding speed governors. "There are times drivers may want to speed up enough to switch lanes, to move away from certain unsafe situations.