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Before the development of reflective plastics, reflectivity was provided by glass reflectors set into the lettering and symbols. New generations of traffic signs based on electronic displays can also change their text (or, in some countries, symbols) to provide for "intelligent control" linked to automated traffic sensors or remote manual input.
Raised reflective markers, such as plastic, ceramic, or metal ones, include a lens or sheeting that enhances their visibility by retroreflecting automotive headlights, while glass road studs gather automotive headlights with a dome shape and reflect the lights with a reflective layer within.
These signs indicate when a multilane highway is being narrowed, when a passing lane is ending, or where the road is widening or a passing lane starting. Another type of sign is used to indicate central "two-way" left turning lane in center of roadway. Warning signs may also warn of "Highway ends", where the road changes class or type.
Delineators are small reflective panels mounted on lightweight metal posts or flexible plastic tubes used to outline roadways and paths. These are about 1.2 metres (3 ft 11 in) high. In the USA, yellow reflective material is used for delineators on the left of the road, and white delineators are used to the right of traffic.
Roads can be motorways, expressways or other routes. In many countries, expressways share the same colour as primary routes, but there are some exceptions where they share the colour of motorways (Austria, Liechtenstein, Hungary, Switzerland, Spain, Sweden) or have their own colour (the countries comprising former Yugoslavia employ white text on blue specifically for expressways).
In some countries and areas (France, Italy, Czech Republic, Slovakia etc.), road markings are conceived as horizontal traffic signs, as opposed to vertical traffic signs placed on posts. Road surface markings are used on paved roadways to provide guidance and information to drivers and pedestrians. Uniformity of the markings is an important ...
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