Discusses bicycle riding safety and courtsey.

Accidental releases of Hydrogen Fluoride (HF) can result in initially dense gas clouds that will typically contain a mixture of gases, aerosols and droplets which can be transported significant distances before lower hazard levels of HF concentration are reached. Containment fences, vapor barriers, and water-spray curtains have been proposed as a means to hold-up or delay cloud expansion, elevate the plume downwind of the barriers, enhance cloud dilution,...