To improve road safety, LTA implemented a variety of road engineering measures, such as adding pedestrian crossing lines with enhanced dash markings, traffic calming markings and "pedestrian crossing ahead" road markings in more locations in 2009. "Your Speed Signs", electronic signs displaying the speed of a passing vehicle, were also introduced so that motorists could be more aware of their speeds and would be more likely to keep to the speed limit. Road studs which flash in tandem with the green man signal at traffic junctions were also installed at more locations to alert motorists to stop for crossing pedestrians.