As a carrier of transmitting specific information, speed limit signs play an important guiding role for drivers to drive safely. However, in reality, there are too many signs, confusion, unclear and inconspicuous, which affect driving. Therefore, standardizing the design and setting of speed limit signs has become an urgent problem for transportation departments.

1. General provisions of speed limit signs

The speed limit sign shall be set at the starting point of the speed limit section, and repeated as required. Speed limit signs shall not be blocked by roadside trees, structures along the line and other traffic signs. The location should ensure that the speed limit information has enough identifiability, identifiability and readability, so that drivers can perceive the environmental changes, so as to transmit information to highway users smoothly and completely.

Speed limit signs should be set separately, and can be used in conjunction with minimum speed limit signs or auxiliary signs as needed. At the end of the speed limit section, a new speed limit sign or a lifting sign should be set.

Except in special circumstances, the speed limit sign should be set above or on the right side of the roadway in the direction of the vehicle. When the conditions are limited, it can be added on the left side of the vehicle direction, such as the central separation zone, but it shall not encroach on the highway building clearance and affect the parking sight distance of the highway.

The speed limit signs of special speed limit sections can be comprehensively used with other traffic signs, traffic markings, deceleration hills and other related facilities as needed.

2. Layout design of speed limit signs

The layout of speed limit signs should be concise, clear, beautiful and unambiguous.

The speed limit sign shall be in the special font for traffic signs, in which Arabic numerals shall be in the regular characters of the special font for B-type traffic signs, and its width shall not be reduced. The usage of minority characters in the speed limit signs of minority autonomous regions shall conform to the current national and industrial standards, as well as the relevant provisions on the social use of minority characters.

When adopting speed limit by vehicle type, combined speed limit by lane and vehicle type, speed limit by time period, and speed limit by special weather, it should be expressed by speed limit signs combined with auxiliary signs.

According to actual needs, speed limit signs can be nested. The speed limit sign is used on the white bottom plate without border, which should be a sign that must be observed; Used on the guide signs, it can provide relevant speed limit information, and corresponding speed limit signs should be set at necessary positions.

3. Requirements for setting speed limit signs

The expressway and the first-class highway as the trunk line should be equipped with speed limit signs at an appropriate position about 500m after the end of the gradual change section of the acceleration lane at the entrance of the main line.

The setting of speed limit signs on first-class highways shall meet the following requirements:

➤ When setting up interchange, it is advisable to set up speed limit signs at an appropriate position about 500m after the end of the gradual change section of the acceleration lane at the entrance of the main line.

➤ At the intersection with the secondary highway as the trunk line, the speed limit sign should be set at the appropriate position 100 ~ 200 m behind the entrance of the primary highway or between the highway number sign and the location distance sign.

➤At the intersection with the plane formed by the intersection of the second-class highway or the third-class highway, the speed limit sign can be set at an appropriate position 100 ~ 200 m behind the entrance of the first-class highway, or between the highway number sign and the location distance sign.

Second, third and fourth grade highway speed limit signs should meet the following requirements:

➤ The second-class highway as the trunk line intersects with the second-class and above highways, and the speed limit sign should be set at the appropriate position after the entrance of the highway; With the intersection of Grade III and Grade IV highways, the speed limit sign can be set at the appropriate position behind the entrance of Grade II highway as required.

➤ As the second, third and fourth grade roads of distribution roads, speed limit signs can be set at appropriate positions after the intersection entrance. The tunnel speed limit sign should be set 100~200m in front of the tunnel entrance, and can be combined with the tunnel height limit sign as needed. The speed limit sign of the extra-large bridge should be set at 0~200m in front of the bridge.

The setting position of the speed limit sign of the extra-large bridge can refer to the setting position of the speed limit sign of the tunnel. Considering that there are fewer signs before the extra-large bridge compared with the tunnel section, and there are no problems such as light and shade adaptation in the extra-large bridge section, only the farthest distance between the speed limit sign of the extra-large bridge section and the extra-large bridge is specified, and the shortest distance between the speed limit sign and the extra-large bridge is not limited.

The speed limit sign in the school area should be set 100~150m away from the starting point of the school area.

The speed limit sections of expressways, first-class highways and second-class highways as trunk lines are long, so the speed limit signs should be set repeatedly when the design speed travel length is infinite at intervals of 0.25h; For other highways, when designing the infinite speed signs with speed and travel length at intervals of 0.25h, it can be determined whether it is necessary to set them repeatedly according to the setting conditions of the speed limit signs.

When it is difficult to set graded speed limit signs, it is advisable to set warning signs to remind vehicle drivers of the danger ahead, or notice signs to remind driving safety.

4. Relevant requirements for the support form of speed limit signs

➤ Column speed limit signs should be set up on two-lane highways.

➤ When single speed limit or vehicle-type speed limit is adopted for four-and six-lane highways, column speed limit signs should be set up, which can be set up in the central divider at the same time as needed; When the traffic volume is large, there are many large vehicles or there are other factors that affect the visibility of column speed limit signs, cantilever or portal speed limit signs should be set up.

➤Eight-lane highway and six-lane highway with lane-divided speed limit, lane-divided and vehicle-divided combined speed limit mode shall be provided with portal speed limit signs.

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The design and setting of speed limit signs should conform to the actual traffic conditions and facilities along the line, so as to provide users with correct and timely information, and guide drivers to reach their destinations smoothly and quickly through speed limit signs and other signs at a glance.