subject: Wig Wag - a strange word but an effective hazard warning tool on emergency vehicles [print this page] Wig Wag - a strange word but an effective hazard warning tool on emergency vehicles
All joking aside, a Wig Wag is something that is a useful tool in the hazard warning light world. Emergency vehicles often have a Wig Wag fitted, and it is a device, which flashes the vehicles headlights at a preset rate. So far so clear, more often than not the Wig Wag will alternate flashing between the right and left headlight, sometimes on high beam. There are some devices that will flash both headlights together. The flashing of headlights on an emergency vehicle increases the visibility of a vehicle and acts as a hazard warning on stationary vehicles.
Some of the more sophisticated Wig Wag devices can alternate through several flash patterns in a cycle. Wig Wag devices are not something that is permitted on private vehicles. They are only to be fitted to emergency vehicles in the main. Although Wig Wag devices and the flash patterns they create can cause problems with other road users, especially oncoming traffic, they are a valid and useful warning sign. In some cases, the flashing of the Wig Wag will look like the vehicles headlights are malfunctioning, but they are set to specifically flash off and on.
The way we signal visually with lights has changed only a small amount over time. We have relied on light as a protector, a guidance tool and as a method of warning. Advances from gas and oil lamps led to mirrors being used to give light that is more powerful. From those humble and simple beginnings, we have been lead to the emergency lighting we use on vehicles today. A Wig Wag is just another method of focusing the light on a vehicle to draw attention to it. The flashing headlights with the lightbars and siren are a very noticeable method of warning.
It's not a nice thought but many drivers on our roads are acting under the influence of alcohol, drugs or prescription medications, or even just simple tiredness and are therefore classed as impaired. Getting the attention of such drivers is challenging and that is why emergency vehicles need to use all of the tools in their arsenal of warning and lighting equipment. A flashing headlight Wig Wag device will increase the visibility of the vehicle and therefore increase the safety of the personnel in or around it if it's stationary.
The flash patterns and the frequency of the flash will highlight a stationary vehicle, and the flashing is recognized normally as hazard warning. A stationary vehicle at the side of the road is a danger to other road users and it needs to be as conspicuous as possible. Banks of lights are effective as are single beacon lights. As a simple and effective method of warning, the Wig Wag devices are useful and used in many situations. Too much light can be as bad as too little light, so a balance needs to be struck on emergency vehicles to ensure that they don't dazzle or confuse others on the roads.
Extreme Tactical Dynamics is a one-stop shop for a Wig wag and many other items like Flashlights, Dash Lights, Deck Lights, etc. Please visit the site for more details of various items available - http://www.extremetacticaldynamics.com/
var LEO_HIGHLIGHTS_IFRAME_TOP_SIZE = new LeoHighlightsDimension(LEO_HIGHLIGHTS_IFRAME_TOP_WIDTH,LEO_HIGHLIGHTS_IFRAME_TOP_HEIGHT);
var LEO_HIGHLIGHTS_IFRAME_BOTTOM_HOVER_SIZE = new LeoHighlightsDimension(LEO_HIGHLIGHTS_IFRAME_BOTTOM_COLLAPSED_WIDTH,LEO_HIGHLIGHTS_IFRAME_BOTTOM_COLLAPSED_HEIGHT);
var LEO_HIGHLIGHTS_IFRAME_BOTTOM_CLICK_SIZE = new LeoHighlightsDimension(LEO_HIGHLIGHTS_IFRAME_BOTTOM_EXPANDED_WIDTH,LEO_HIGHLIGHTS_IFRAME_BOTTOM_EXPANDED_HEIGHT); var LEO_HIGHLIGHTS_DIV_HOVER_SIZE = new LeoHighlightsDimension(LEO_HIGHLIGHTS_IFRAME_TOTAL_COLLAPSED_WIDTH,LEO_HIGHLIGHTS_IFRAME_TOTAL_COLLAPSED_HEIGHT);
var LEO_HIGHLIGHTS_DIV_CLICK_SIZE = new LeoHighlightsDimension(LEO_HIGHLIGHTS_IFRAME_TOTAL_EXPANDED_WIDTH,LEO_HIGHLIGHTS_IFRAME_TOTAL_EXPANDED_HEIGHT); /** * Sets the size of the passed in element * * @param elem * @param dim * @return */
function _leoHighlightsSetSize(elem,dim)
{ try { // Set the popup location elem.style.width = dim.width + "px"; if(elem.width) elem.width=dim.width; elem.style.height = dim.height + "px"; if(elem.height) elem.height=dim.height; } catch(e) { _leoHighlightsReportExeception("_leoHighlightsSetSize()",e); } } /** * This can be used for a simple one argument callback * * @param callName * @param argName * @param argVal * @return */
function _leoHighlightsSimpleGwCallBack(callName,argName, argVal)
{ try { var gwObj = new Gateway(); if(argName) gwObj.addParam(argName,argVal); gwObj.callName(callName); } catch(e) { _leoHighlightsReportExeception("_leoHighlightsSimpleGwCallBack() "+callName,e); }
} /** * This gets a url argument from the current document. * * @param url * @return */
function _leoHighlightsGetUrlArg(url, name )
{ name = name.replace(/[[]/,"\[").replace(/[]]/,"\]"); var regexS = "[\?&]"+name+"=([^]*)"; var regex = new RegExp( regexS ); var results = regex.exec(url); if( results == null ) return ""; else return results[1];
} /** * This allows to redirect the top window to the passed in url * * @param url * @return */
} /** * This will find an element by Id * * @param elemId * @return */
function _leoHighlightsFindElementById(elemId,doc)
{ try { if(doc==null) doc=document; var elem=doc.getElementById(elemId); if(elem) return elem; /* This is the handling for IE */ if(doc.all) { elem=doc.all[elemId]; if(elem) return elem; for ( var i = (document.all.length-1); i >= 0; i--) { elem=doc.all; if(elem.id==elemId) return elem; } } } catch(e) { _leoHighlightsReportExeception("_leoHighlightsFindElementById()",e); } return null;
} /** * Get the location of one element relative to a parent reference * * @param ref * the reference element, this must be a parent of the passed in * element * @param elem * @return */
function _leoHighlightsGetLocation(ref, elem) { _leoHighlightsDebugLog("_leoHighlightsGetLocation "+elem.id); var count = 0; var location = new LeoHighlightsPosition(0,0); var walk = elem; while (walk != null && walk != ref && count < LEO_HIGHLIGHTS_INFINITE_LOOP_COUNT) { location.x += walk.offsetLeft; location.y += walk.offsetTop; walk = walk.offsetParent; count++; } _leoHighlightsDebugLog("Location is: "+elem.id+" - "+location); return location;
} /** * This is used to update the position of an element as a popup * * @param IFrame * @param anchor * @return */
function _leoHighlightsUpdatePopupPos(iFrame,anchor)
{ try { // Gets the scrolled location for x and y var scrolledPos=new LeoHighlightsPosition(0,0); if( self.pageYOffset ) { scrolledPos.x = self.pageXOffset; scrolledPos.y = self.pageYOffset; } else if( document.documentElement && document.documentElement.scrollTop ) { scrolledPos.x = document.documentElement.scrollLeft; scrolledPos.y = document.documentElement.scrollTop; } else if( document.body ) { scrolledPos.x = document.body.scrollLeft; scrolledPos.y = document.body.scrollTop; } /* Get the total dimensions to see what scroll bars might be active */ var totalDim=new LeoHighlightsDimension(0,0) if (document.all && document.documentElement && document.documentElement.clientHeight&&document;.documentElement.clientWidth) { totalDim.width = document.documentElement.scrollWidth; totalDim.height = document.documentElement.scrollHeight; } else if (document.all) { /* This is in IE */ totalDim.width = document.body.scrollWidth; totalDim.height = document.body.scrollHeight; } else { totalDim.width = document.width; totalDim.height = document.height; } // Gets the location of the available screen space var centerDim=new LeoHighlightsDimension(0,0); if(self.innerWidth && self.innerHeight ) { centerDim.width = self.innerWidth-(totalDim.height>self.innerHeight?16:0); // subtracting scroll bar offsets for firefox centerDim.height = self.innerHeight-(totalDim.width>self.innerWidth?16:0); // subtracting scroll bar offsets for firefox } else if( document.documentElement && document.documentElement.clientHeight ) { centerDim.width = document.documentElement.clientWidth; centerDim.height = document.documentElement.clientHeight; } else if( document.body ) { centerDim.width = document.body.clientWidth; centerDim.height = document.body.clientHeight; } // Get the current dimension of the popup element var iFrameDim=new LeoHighlightsDimension(iFrame.offsetWidth,iFrame.offsetHeight) if (iFrameDim.width 0) position.x = anchorPos.x + anchorDim.width; else if (anchorScreenPos.x - anchorDim.width - iFrameDim.width > 0) position.x = anchorPos.x - anchorDim.width; else // default to below position.y = anchorPos.y + anchorDim.height; _leoHighlightsDebugLog("_leoHighlightsUpdatePopupPos() - sideBottom: "+position); } } /* Make sure that we don't go passed the right hand border */ if(position.x+iFrameDim.width>centerDim.width-20) position.x=centerDim.width-(iFrameDim.width+20); // Make sure that we didn't go passed the start if(position.x
