A racing vehicle for providing dynamic advertisement opportunities includes a digital sign or digital signs mounted thereto. Digital sign(s) can present content in different manners. Digital sign(s) may receive content and instructions for presenting the content via a user interface or from an external device via a communication interface (e.g., wireless interface). Digital sign(s) include a mobile power source (e.g., battery, fuel cell, solar cell). Digital sign(s) may be preformed to fit on a specific portion of the racing vehicle and be secured to the body or frame of the racing vehicle in various manners. Content presented on the digital sign may be changed per event that the racing vehicle partakes in and thus provides additional advertisement opportunities for the racing vehicle. The racing vehicle is any type of competitive vehicle, including single wheel vehicles, two-wheel vehicles, four-wheel vehicles, tracked vehicles, flying vehicles and water vehicles.

The practice of this invention enables saving a life. A passive distress alert for distressed vessel in water is provided. The self-activating alert is positioned on or near hull bottom zone and distress message is at least partially presented, without human or mechanical, electronic or other trigger, when vessel is keel over or in other overturned positioned and can indicate relative percent keel over. The alert reflects natural and artificial light and/or has components which are fluorescent, with or without special black light, either at day or night to present a distress message to a detector. Detector can be an aided or unaided human eye, camera, bar code reader, or other alphabetic or numerical character or symbol electronic recognition device. Distress message can be SOS, MOB, HELP, CQD, R&R, MAYDAY and other local or universal distress messages or combinations thereof or special distress alert comprising bars, dots, dashes and other symbols. A vessel comprising a passive distress alert is disclosed.