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Light guides are commonly used to distributively light dashboard displays, [155] and premium vehicles are beginning to use distributive systems for lighting such items as door locks, window controls, and cup holders. [156] Distributive exterior lighting has also been explored, with high-intensity central light sources. [157]
The three second rule is a time for the defensive driver to judge the minimum safe trailing distance to help avoid collisions under ideal driving conditions. The red car's driver picks a tree to judge a two-second safety buffer. The two-second rule is a rule of thumb by which a driver may maintain a safe trailing distance at any speed.
For example, the vehicular green interval is the period of time that vehicular traffic has a green signal. The interval is fixed in pre-timed control and varied in actuated control. In actuated settings, the minimum interval in the minimum amount of time for which a signal will stay green before changing.
According to § 15 StVO, a stranded vehicle must be secured with a warning triangle at a sufficient distance, whereby the law orders a minimum distance of 100 metres in the case of fast traffic, such as motorways. This applies not only to the driver of broken-down vehicles, but also the rescue service that stops and offers help.
Traffic lights can have several additional lights for filter turns or bus lanes. Road crossing of A970 with Sumburgh Airport's runway in Shetland. The movable barrier closes when aircraft land or take off. Horizontally-mounted signals in Japan. A set of lights, known as a signal head, [19]: 3.2.4 may have one, two, three, or more aspects. The ...
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In some areas, a "prepare to stop" sign with two alternately flashing yellow lights is installed in locations where a high-speed road (design speed usually at least 55 mph / 90 km/h) leads up to a traffic light, where the traffic light is obscured from a distance (or both conditions), or before the first traffic signal after a long stretch of ...
Freeway B: This designates all other divided roadways with full control of access where lighting is needed. In the European Union, for statistical and safety purposes, some distinction might be made between motorway and expressway. For instance a principal arterial might be considered as: Roads serving long distance and mainly interurban movements.