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When the indicators of a possible rear lift-off are detected, the system releases brake pressure on the front wheel to counter this behavior. The bag itself and its inflation mechanism are concealed within the steering wheel boss (for the driver), or the dashboard (for the front passenger), behind plastic flaps or doors that are designed to tear open under the force of the bag inflating. In left-hand drive vehicles, the turn indicator stalk is usually located to the left of the steering wheel. Many police motor vehicles, and less often other emergency services, also fit LED matrix variable message displays to vehicle lightbars. In Russia and Belarus, traffic police use red and blue lights, while conventional police along with the rest of the emergency services use only blue lights. In the UK many emergency vehicles have lights on the side of the bonnet, which helps to warn oncoming traffic when pulling out of junctions.

The modern trend of locating sirens on or near the front bumper of emergency vehicles has resulted in many lightbar models eliminating the siren housing in lieu of more lighting. Installation of lighting and light-signalling devices for L3 vehicles"" (PDF). Amber coloured lighting is used as warning lights on vehicles such as construction and garbage collection trucks. A key disadvantage of relying solely on internal lighting is the number of lights required to achieve true 360 degree visibility, with most lights usually concentrated front and rear. This pricing transparency is not a number that most dealers will feel comfortable about being shared. There may be a number of hazards to other road users related to the use of emergency beacons, and these effects should be mitigated as far as possible during vehicle design. It also concluded that factors such as flash pattern were important, with simultaneously flashing beacons attracting attention far quicker than alternately flashing versions, although this did increase discomfort glare. By far the most common colors for the core emergency services to use are blue and red, and there are some arguments for using both. Police in Finland, Estonia, Germany and Sweden use a forward-facing red light to indicate that a driver must pull over and stop.

George Smith Duncan. For this system he introduced the pull curve and the slot brake; the former was a way to pull cars through a curve, since Dunedin's curves were too steep to allow coasting, while the latter forced a wedge down into the cable slot to stop the tram, which was deemed necessary after the line had a runaway tram some two months after it opened. The bottom dropped out of the domestic auto and small truck business at the peak of the recession driving total sales down to under 10 million units. In Queensland it is also used on some Queensland Parks and Wildlife Service (QPWS) fire units along with the amber. Sometimes referred to as purple, magenta lights are primarily used by the National Heavy Vehicle Regulator (NHVR), heavy vehicle enforcement/escort officers of Transport for NSW, Victorian VicRoads and South Australian and Queensland Transport Safety Inspectors. Queensland State Emergency Service motor vehicles are only authorized to display amber lights under certain circumstances. Because of these visual advantages, these vehicles are sometimes referred to as "stealth" vehicles. Consequently, discs are less prone to the brake fade caused when brake components overheat.

An AC motor is generally cheaper but the components required to run it in an electric vehicle such as the controller and inverter makes it more expensive than the DC motor. Other cable car systems were implemented in Europe, though, among which was the Glasgow District Subway, the first underground cable car system, in 1896. (London, England's first deep-level tube railway, the City & South London Railway, had earlier also been built for cable haulage but had been converted to electric traction before opening in 1890.) A few more cable car systems were built in the United Kingdom, Portugal, and France. However, many other systems used similar or larger guideways, including the Morgantown PRT, and the guideway was smaller than a conventional roadway. Older airbag systems contained a mixture of sodium azide (NaN3), KNO3, and SiO2. This same study compared different light colors for glare and detection time under both daylight and night conditions. When all colors were held at equal intensity, amber had the poorest detection time both daytime and night.