Freeway and expressway wayfinding signs

1. Functions of high and fast wayfinding signage system 

(1) To indicate the arrival street at intersections or interchanges. highway routes or other destinations: 

(2) To give advance notice that the driver will enter an intersection or interchange ahead, and to prompt the driver to take appropriate measures: 

(3) To guide the road user to enter the appropriate lane before the diversion or merging point: 

(4) To confirm whether the route and direction of travel are correct or not during the travel journey; 

(5) To indicate the exact distance to the destination: 

(6) To indicate the direction of access to public stations, rest areas, and scenic routes: 

(7) Provide other information of use to road users.

In terms of the design of directional signs, road users hope that when approaching a directional sign, it is clearly visible and the contents of the sign can be fully understood within the allowed reaction time, that is to say, the desired design features are as follows: a long viewing distance, sufficiently large text and graphics, and simple and easy-to-understand graphics. Wayfinding signs require the use of standard colors and shapes, so that road users can quickly read, the United States of America's high, expressway wayfinding signs, except in special circumstances, generally using white text and symbols, green background, and requires a good reflective effect.

In the United States, due to the geographic environment, geometric characteristics, operating rules and other factors, urban areas and townships, high, fast road has different characteristics, in the design of the wayfinding signage system to take into full account this urban and rural differences, specifically as follows: 

2. The characteristics of the urban area, high, fast road 

(1) the main road in each direction is more than two lanes; 

(2) the entire road traffic volume is relatively high; 

(3) interchange exit and entrance traffic volumes are relatively high; 

(4) the spatial distances between interchanges are relatively close; 

(5) lighting is provided on both the mainline of the roadway and the interchanges; 

(6) three or more interchanges serve the major cities through which they pass; 

(7) a significant portion of the population of the city is served by loop and radial roadways; and 

(8) off-street development creates visual clutter, etc.

According to the traffic operation characteristics of urban highways and expressways, road geometric conditions, etc., it is usually necessary to develop targeted wayfinding signage setup programs to meet different usage needs, such as: the use of interchange sequence signs, the use of diagrammatic signs before interchanges or intersections; advance warning signs closer to the exit of interchanges, and appropriately reduce the number of sign placement points after the interchanges: the use of crossings to set up attachment type Signs, etc.

3. Township high. Characteristics of the expressway 

township range of the high. The biggest feature of the expressway is that the distance between interchanges is relatively far, so the road sections before and after each interchange can be set up according to the appropriate location and distance to ensure that the road users can provide the best use of the results. However, due to the township high and expressway traffic are relatively small, adjacent lanes almost no vehicles are traveling, the entrance and exit traffic is also relatively small, so drivers in the driving process is easy to produce monotonous and boring, the phenomenon of carelessness. This also emphasizes the importance of wayfinding signs, which remind drivers to make decisions and take decisive action at the right time.