Visual distress signals (VDS) are mandatory on most boats but hopefully never needed. VDS come in various flavors. You should not only check at the start of every season to make sure your flares are ...

The Manual on Uniform Traffic Control Devices, the bible for traffic signs, lists two kinds of pedestrian-activated signals.

Both pedestrian hybrid beacons and rectangular rapid flashing beacons have been shown to reduce pedestrian crashes, but in a new study, researchers compared behavior at the two different types of ...