Traffic signs for multi-lane general roads

A--Ordinary highway sign and marking setup characteristics

Compared with motorways and express arterial roads, ordinary highways, in addition to smaller design speeds, have lower geometric design standards for their routes, intersections in the form of planar intersections (including signalised, two-way stop control and all-way stop control), and especially multi-lane highways, which not only need to set up openings in the central median to allow vehicles to make left turns, but also need to consider the access of other roads. In other words, the management of intersections and entrances on general highways, especially multi-lane highways, is critical to the traffic safety and operational efficiency of the highway. Therefore, the own design and operational characteristics of ordinary highways determine the diversity of the use of traffic control facilities at their intersections and entrances and exits, such as signals, traffic signs (especially stop signs and give way signs), pavement markings and their joint use. In addition, the design and use of traffic control facilities on general roads take into account the characteristics of the area through which the road passes, such as urban areas of towns (bicycles, pedestrians, etc.) and rural areas (agricultural machinery, non-motorised vehicles, etc.).

The basic principles of traffic signs and markings, such as taking into account specific needs, attracting the attention of road users, conveying concise and easily understandable messages, inducing compliance by road users and giving road users sufficient time to react, are entirely appropriate for ordinary roads. With regard to the specific requirements for the design and use of traffic signs and markings, such as shape, colour, layout information and placement, the relevant contents of Chapter 1 are also suitable for ordinary highways. However, the requirements and standards of sign markings for ordinary highways are lower than those for motorways and express arterial roads. For example, the size of ordinary highway signs and markings, warning signs in front of the distance, etc., is smaller than that of motorways and express arterial roads. In addition, signs on ordinary roads concerning various road intersections, other road entrances and road-railway intersections occupy a considerable proportion. On two-lane general highways, in addition to traffic signs about speed limits and intersections, warning signs about overtaking and their corresponding arrow signs, road markings, etc., are most frequently used.

B--Traffic signs and markings for multi-lane general roads

The so-called general road sections, in this context, refer to road sections other than intersections, median openings (left turns) and flat longitudinal curves. On general sections of multi-lane general highways, common traffic signs include speed limit signs, highway numbers, place names, tourist and recreational attractions, etc. Road markings mainly include lane lines and road edge markings. It should be noted that there are national roads (US) and state roads (SR). The numbering of national roads is determined by AASHTO based on recommendations from state DOTs, and the numbering of state roads is determined by state DOTs. Given is a photograph of a 4-lane, divided travelling state road with a median. Other signs include: green place name signs - white speed limit signs - black and white highway number (i.e. road name) signs and end of lane signs. Numbering and mileage signs for the general highway in question. The yellow diamond-shaped end-of-lane graphic sign on the right is commonly used on multi-lane ordinary highways to alert road users that the number of lanes ahead is decreasing and that vehicles travelling in the right lane should be careful to slow down and merge into the left lane. The end of lane sign layout information, either in text or directly in graphics.

U.S. general highway numbering signs and their directional aids. National highway signs are rectangular signs with a black background, white shield, and black lettering; state highway signs are rectangular signs with a white background, black lettering, and black edges; and directional signs are rectangular signs with a white background, black lettering, and black edges that indicate the direction of travel in words. National and state highway numbers-typically are not duplicated and their signs are the same size. East-west roads are numbered even, and north-south roads are numbered odd. Some highways may also be a memorial highway, when additional memorial highway signs, memorial highway signs layout information design varies from place to place.

An ordinary highway mileage sign is a rectangular sign with a blue background, white lettering and a white border. The number of miles from west to east, from south to north, in order to each mile increment, only along the bridge and culvert, etc., to add a mileage sign, indicating the specific mileage. Multi-lane general highway mileage signs, located on both sides of the highway, but when passing through the outskirts of the city, often in the central median, according to 0.2mile additional mileage signs.

Separated travelling multi-lane highway lane reduction signs. One is a text message sign and the other is a pattern message sign. Both are diamond-shaped signs with a yellow background, black lettering, and a black border, and are usually used in conjunction with each other. The text sign is placed in front and the patterned sign is placed after a certain distance to remind road users that the right lane ahead ends and merges into the left lane. In text messages, important information its font should be larger.

In the United States, some highways may include both multi-lane and two-lane road segments. Therefore, in addition to the Lane Reduction Sign, the End of Divided Travelling Highway Sign is erected at the end of the multi-lane section. This sign is also a diamond-shaped sign with a yellow background, black lettering, and a black border to alert road users that the divided highway ends ahead.

In addition to the above signs, there are also special-purpose prohibition or warning signs permanently erected on certain sections of the road to alert road users to certain possible situations or to require road users to take certain actions to ensure the safety of the road users themselves or others. These possible situations include the presence or stopping of school buses transporting pupils, left-turning vehicles, junction warning signs, the presence of emergency vehicles such as police cars and ambulances, and wild animals crossing the road.