Rational Triangles
Triangles in the Euclidean plane such that all three sides are rational. With tables of Heronian and Pythagorean triples.
http://grail.cba.csuohio.edu/~somos/rattri.html

The Nautilus Spiral - A Sequence of Triangles
Studying the expanding sequence of isosceles right triangles utilizing recursive and explicit functions. With diagrams, explanations, and tables.
http://www.theoldpro.net/ms/nautilusproblem

Polyiamond Exclusion
Colonel Sicherman asks what fraction of the triangles need to be removed from a regular triangular tiling of the plane, in order to make sure that the remaining triangles contain no copy of a given polyiamond.
http://www.monmouth.com/~colonel/xpoly/xpoly.html

The Golden Pentagon
MathPages depiction of tiling a plane using a progression of equilateral triangles dividing a pentagon. Most interesting is that this pentagon is uniquely and recursively divided by triangles, just as is seen in the more common recursive division of the Golden Rectangle.
http://mathpages.com/home/kmath153.htm

Wikipedia: Miranda Warning
Provides encyclopedic background information and common misconceptions regarding this device for warning people that they do not have to incriminate themselves.
http://en.wikipedia.org/wiki/Miranda_Warning

Boddingtons Ltd
Boddingtons manufacture extruded plastic mesh & nets, barrier tapes, underground warning tapes, detectable tapes, grass protection mesh, turf reinforcement mesh & barrier fencing mesh
http://www.boddingtons-ltd.com/

P. Berghaus GmbH
Willkommen bei der Peter Berghaus GmbH. Wir sind Ihr kompetenter Ansprechpartner für Signalbau, Signalanlagen, Ampelanlagen, Stahlschutzwände, Baustellenabsicherung, Lauflichtanlagen, Verkehrsabsicherung, Schilder, Lichtzeichenanlagen, Signal-Leuchten, Signal-Lampen, Pylone, Kegel, Leitkegel, LZA, Lichtsignalanlagen, Warntafeln, Absperrtafeln, Leitwände, Rundumleuchten, Rundumkennleuchten, Blaulicht, Gelblicht, Verkehrsschilder , Verkehrszeichen, Leuchtpfeile, Baken und Fußplatten
http://www.berghaus-signalbau.de/

Warning Systems (UK) Limited
Warning Systems UK Ltd - The UK Market leader in Public Safety
http://www.warningsystemsgb.co.uk

Alert Systems
Flood Warning Homepage, with information on technologies, organizations, and vendors
http://www.alertsystems.org/

Sense Technologies, Inc
ScopeOut® is an after-market safety mirror system for cars, light trucks and SUVs. The ScopeOut® system is mounted externally, or internally, depending on the model, and allows a driver to view pedestrian and vehicle traffic from both directions while backing out of a parking space or from a driveway. The customer has a substantially wider view of the rear sides of the vehicle, allowing for greater safety for drivers and pedestrians alike.
http://www.sensetech.com/