CN114606880A - Variable double-sided active luminous road traffic sign - Google Patents
Variable double-sided active luminous road traffic sign Download PDFInfo
- Publication number
- CN114606880A CN114606880A CN202210389273.4A CN202210389273A CN114606880A CN 114606880 A CN114606880 A CN 114606880A CN 202210389273 A CN202210389273 A CN 202210389273A CN 114606880 A CN114606880 A CN 114606880A
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- sided
- circuit board
- double
- light
- emitting
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- 235000012431 wafers Nutrition 0.000 claims abstract description 28
- 239000004593 Epoxy Substances 0.000 claims abstract description 9
- 238000003466 welding Methods 0.000 claims abstract description 6
- 241000218202 Coptis Species 0.000 claims abstract description 5
- 235000002991 Coptis groenlandica Nutrition 0.000 claims abstract description 5
- 239000003795 chemical substances by application Substances 0.000 claims description 7
- 239000003822 epoxy resin Substances 0.000 claims description 6
- 229920000647 polyepoxide Polymers 0.000 claims description 6
- 230000002159 abnormal effect Effects 0.000 claims description 3
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 3
- 230000007613 environmental effect Effects 0.000 abstract description 4
- 230000003993 interaction Effects 0.000 abstract description 3
- 230000006641 stabilisation Effects 0.000 abstract description 2
- 238000011105 stabilization Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 239000003086 colorant Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 230000001939 inductive effect Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000000149 argon plasma sintering Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 238000004891 communication Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
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- 230000007774 longterm Effects 0.000 description 1
- 238000007726 management method Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
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- 239000010902 straw Substances 0.000 description 1
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Images
Classifications
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01F—ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
- E01F9/00—Arrangement of road signs or traffic signals; Arrangements for enforcing caution
- E01F9/60—Upright bodies, e.g. marker posts or bollards; Supports for road signs
- E01F9/604—Upright bodies, e.g. marker posts or bollards; Supports for road signs specially adapted for particular signalling purposes, e.g. for indicating curves, road works or pedestrian crossings
- E01F9/615—Upright bodies, e.g. marker posts or bollards; Supports for road signs specially adapted for particular signalling purposes, e.g. for indicating curves, road works or pedestrian crossings illuminated
- E01F9/617—Illuminated or wired-up posts, bollards, pillars or like upstanding bodies or structures for traffic guidance, warning or control
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01F—ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
- E01F9/00—Arrangement of road signs or traffic signals; Arrangements for enforcing caution
- E01F9/60—Upright bodies, e.g. marker posts or bollards; Supports for road signs
- E01F9/604—Upright bodies, e.g. marker posts or bollards; Supports for road signs specially adapted for particular signalling purposes, e.g. for indicating curves, road works or pedestrian crossings
- E01F9/619—Upright bodies, e.g. marker posts or bollards; Supports for road signs specially adapted for particular signalling purposes, e.g. for indicating curves, road works or pedestrian crossings with reflectors; with means for keeping reflectors clean
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01F—ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
- E01F9/00—Arrangement of road signs or traffic signals; Arrangements for enforcing caution
- E01F9/60—Upright bodies, e.g. marker posts or bollards; Supports for road signs
- E01F9/623—Upright bodies, e.g. marker posts or bollards; Supports for road signs characterised by form or by structural features, e.g. for enabling displacement or deflection
- E01F9/65—Upright bodies, e.g. marker posts or bollards; Supports for road signs characterised by form or by structural features, e.g. for enabling displacement or deflection with rotatable, swingable or adjustable signs or signals
Abstract
The application relates to the field of road traffic signs, in particular to a variable double-sided active light-emitting road traffic sign. Comprises a double-sided light-emitting circuit board, a transparent plate, a control unit, a frame and a bracket. Have on the two-sided luminous circuit board and run through the aperture of two-sided luminous circuit board, in the aperture with two-sided luminous circuit board horizontal direction unanimously places a plurality of positive pole pins, a negative pole pin, a plurality of wafers of negative pole pin side welding, positive pole pin place in around the negative pole pin, use the gold thread to connect the wafer with positive pole pin encapsulates this region with epoxy, and two sides of two-sided luminous circuit board form the arch. The application has fused variable and initiative light emitting characteristic, has promoted the matching nature of recognition demand, has promoted sign job stabilization nature, environmental suitability, has simplified traditional structure, and the cost is reduced has reduced thickness to the interaction between the machine has been realized.
Description
Technical Field
The application relates to the field of road traffic signs, in particular to a variable double-sided active light-emitting road traffic sign.
Background
In the current society, the road traffic environment is complex and the vehicle density is high. A large number of road traffic signs are typically used in traffic management. Road traffic signs are facilities that convey information to road users in colors, shapes, characters, graphics, etc. for managing traffic. The traffic sign provides accurate and timely information and guidance, so that road users can smoothly and quickly arrive at the destination, and smooth traffic and driving safety are promoted.
The urban road traffic sign has a reflective film sign, an external auxiliary lighting sign, an active light-emitting sign and an LED variable information sign.
Active luminous signs, which have two special standards, the "interior lighting signs" and the "LED active luminous road traffic signs". The active luminous sign is applied to the roads with long-term insufficient ambient light such as tunnels at first, and is popularized and applied to partial urban roads in China along with the gradual maturity of the LED technology. The main development directions for active luminous signs include: firstly, the matching between the setting of the active light source and the reading requirement is improved; secondly, the uniformity of the night visual effect of the traffic signs is improved; thirdly, the working stability and the environmental adaptability of the active luminous sign are improved; and fourthly, the cost of the active luminous road traffic sign is reduced.
The LED variable information sign mainly adopts a dot matrix type, can generate various characters and patterns, has the greatest advantage, and has more urban traffic vehicles and very frequent dynamic change to induce a driver to reasonably plan a route and relieve traffic jam. The information is issued through the LED variable information signs, so that the effect on the whole urban road network traffic organization is better exerted. But the limitation of cost, volume, necessity and the like is large.
In the present day that the unmanned technology is more and more widely applied, road participants are not limited to people but are more and more widely expanded to machines, and the main difficulties faced by machine identification are: the background of the road traffic sign is quite complex, the color distortion is extremely serious, and the geometric distortion of different degrees exists; the theory and technique of color image processing is not yet mature. The method of simplifying complex problems, improving the traditional method, adopting an intelligent method based on color information is an important development direction in the future.
In order to integrate variable and active light emitting characteristics, improve the matching of reading requirements, improve the working stability and environmental adaptability of the sign, simplify the traditional structure, reduce the cost of the active light emitting road traffic sign, reduce the thickness and realize the interaction between machines, a scheme for improving the prior art is needed.
The foregoing background is that technical information which the inventors have possessed to derive the invention or learned in the course of deriving the invention is not necessarily the publicly known art disclosed before applying the invention.
Disclosure of Invention
The inventor finds that in most cases, road traffic signs are changed, and the purposes of inducing a driver to reasonably plan a route and relieving traffic jam can be achieved only by simply changing the sign types.
Look up the data, the emitting diode structure includes an anodal pin, a negative pole pin, and the reflection cap is placed on negative pole pin top for the bowl form, places the wafer in the reflection cap, and the wafer is connected with anodal pin through the gold thread, wholly is packaged by transparent epoxy, forms the epoxy lens simultaneously.
The light emitting angle of the led, i.e. the light scattering angle thereof, is generally controlled by the reflective cap and the epoxy lens, and generally the deeper the reflective cap, the smaller the angle, and the shape of the epoxy lens also has an influence on the light emitting angle, for example, the 5mm bullet head must have a smaller angle than the 5mm straw head.
The light emitting angle of the diode can also be controlled by adding a scattering agent when the diode is produced. There are three main categories of existing package leds:
high directivity: typically a tip epoxy package or a package with a metal reflective cavity and no scattering agent. Has a light emission angle of 5-20 DEG or less, has high directivity, and can be used as a local illumination light source or combined with a photodetector to constitute an automatic detectorAnd (4) a detection system.
Standard type: commonly used as indicator lights, have a light angle of 20 to 45.
Scattering type: this is an indicator lamp with a large viewing angle, an emission angle of 45 to 90 or more, and a large amount of scattering agent.
In summary, no reflective cap is used in the led structure, and by adjusting the shape of the epoxy lens and the amount of the scattering agent, the light emitting angle of the single-chip led can be infinitely close to 180 °, and two chips are placed back to back, which makes it possible to realize a 360-degree light source.
In order to fuse variable and initiative luminous characteristic, promote the matching nature of recognition demand, promote sign job stabilization nature, environmental suitability, simplify traditional structure, reduce initiative luminous road traffic sign cost, reduce thickness to realize the interaction between the machine, this application provides a variable two-sided initiative luminous road traffic sign.
A variable double-sided active light-emitting road traffic sign comprises a double-sided light-emitting circuit board, a transparent plate, a control unit, a frame and a support, wherein the transparent plate, the double-sided light-emitting circuit board and the transparent plate are arranged in the frame in sequence, and the frame and the control unit are arranged on the support.
Have on the two-sided luminous circuit board and run through the aperture of two-sided luminous circuit board, in the aperture with two-sided luminous circuit board horizontal direction unanimously places a plurality of positive pole pins, a negative pole pin, a plurality of wafers of negative pole pin side welding, positive pole pin place in around the negative pole pin, use the gold thread is connected the wafer with positive pole pin encapsulates this region with epoxy, and two sides of two-sided luminous circuit board form protrudingly.
Furthermore, the top end of the negative electrode pin is of a T-shaped structure, and the side face of the negative electrode pin is used for welding the wafer. The number of the wafers is 2, the wafers are welded on two sides of the T-shaped structure, and the light-emitting angle of each wafer is close to 180 degrees. The number of the positive pins is 2, the positive pins are placed on two sides of the T-shaped structure, and the top ends of the positive pins are slightly lower than the horizontal line of the lower edge of the wafer. The plurality of positive electrode pins and the negative electrode pins are uniformly arranged and are not in contact. The positive electrode pins correspond to the wafers one to one and are connected through the gold wires. The epoxy resin is transparent, a large amount of scattering agent is mixed, and hemispherical bulges are formed on two sides of the double-sided light-emitting circuit board to form a lens.
Furthermore, a plurality of light-emitting points exist on the double-sided light-emitting circuit board, when part of the light-emitting points or all of the light-emitting points are lighted, a plurality of patterns are formed, and the double sides of the patterns are visible. The control unit may on the one hand adjust the pattern of the variable double-sided luminous road traffic sign and on the other hand may send the current variable double-sided luminous road traffic sign status: the current display pattern can be sent to the user side, whether the current display pattern has abnormal states or not can be sent to the unmanned automobile, and the current indication information can also be sent to the unmanned automobile.
The technical scheme provided by the application can comprise the following beneficial effects: the road traffic sign has double-sided light emission, the structure only comprises one layer of circuit board, the whole structure is simple, the thickness is small, the cost is saved, and the integral attractiveness is improved. The mark types can be changed to a certain extent, the matching of reading requirements is improved, and the purposes of inducing a driver to reasonably plan a route and relieving traffic jam are achieved. Meanwhile, the variable double-sided active luminous road traffic sign provides support for realizing an intelligent road traffic sign for machine identification and communication, and more functions can be further added.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a sectional view of the light-emitting double-sided wiring board of the present application.
Fig. 2 is an exploded view of the present application.
Fig. 3 is a display state of the present application indicating no-pass.
Fig. 4 is a display state of the present application when indicating an intersection.
Fig. 5 is a display state of the present application indicating that entry is prohibited.
Fig. 6 is a display state of the present application indicating that parking is prohibited.
1, a positive electrode pin; 2. a negative electrode pin; 3. an epoxy resin; 4. gold thread; 5. a wafer; 6. a double-sided light emitting circuit board; 7. a transparent plate; 8. a control unit; 9. a frame; 10. and (4) a bracket.
Detailed Description
A variable double-sided active light-emitting road traffic sign is shown in figure 2 and comprises a double-sided light-emitting circuit board 6, a transparent plate 7, a control unit 8, a frame 9 and a bracket 10; the frame 9 is light-proof and is provided with a mounting groove for mounting, the transparent plate 7, the double-sided light-emitting circuit board 6 and the transparent plate are arranged in the sequence 7, the frame is mounted in the frame 9, and a sealing rubber strip is arranged to increase the sealing performance. The frame 9 and the control unit 8 are both mounted on the support 10.
As shown in fig. 1, there is the aperture that runs through on the two-sided light emitting circuit board 6, in the aperture with two anodal pins 1, a negative pole pin 2 are placed to two-sided light emitting circuit board horizontal direction unanimity, anodal pin 1 with 2 one end of negative pole pin are buckled, and are outstanding in the one side of two-sided light emitting circuit board 6, just 2 outstanding lengths of negative pole pin are shorter, and are a plurality of 1 outstanding lengths of anodal pin are unanimous, and compare 2 outstanding lengths of negative pole pin are longer for distinguish positive negative pole pin.
The top end of the negative electrode pin 2 is of a T-shaped structure, and the side face of the negative electrode pin is used for welding the wafer 5. The number of the wafers 5 is 2, the wafers are welded on two sides of the T-shaped structure, and the light emitting angle of each wafer 5 is close to 180 degrees. The positive electrode pins are arranged on two sides of the T-shaped structure, and the top ends of the positive electrode pins 1 are slightly lower than the horizontal line of the lower edge of the wafer 5. The two positive electrode pins 1 and the negative electrode pin 2 are uniformly arranged and are not in contact. The positive electrode pins 1 correspond to the wafers 5 one by one, and are connected by the gold wires 4. And packaging the area by using epoxy resin 3, wherein the epoxy resin 3 is transparent, a large amount of scattering agent is mixed, and hemispherical bulges are formed on two sides of the double-sided light-emitting circuit board 6 to form a lens.
The double-sided light-emitting circuit board 6 is provided with a plurality of light-emitting points, all the light-emitting points are arranged in a concentric circle shape, the light-emitting points have a plurality of colors according to preset patterns, a mark pattern is formed when the light-emitting points are matched with the preset patterns, a plurality of patterns are formed when partial light-emitting points or all light-emitting points are matched with the preset patterns, and the patterns are visible on double sides.
During operation, the control unit 8 can adjust the pattern of the variable double-sided active light-emitting road traffic sign on one hand, and can change the sign type in real time according to the current road condition. On the other hand, the current variable double-sided active light-emitting road traffic sign state can be sent.
And sending the current variable double-sided active luminous road traffic sign state, namely sending the current display pattern to the user side to form a visible road sign network if the current display pattern is abnormal or not. The current indication information can also be sent to the unmanned automobile, the unmanned automobile runs on the road provided with the variable double-sided active luminous road traffic sign, and equivalently, police are on duty at each place needing the road sign to remind, and the unmanned automobile is guided.
In the scene 1, when a cross road is constructed, the road section is prohibited from passing, the variable double-sided active light-emitting road traffic sign is installed, the signal lamp is lightened, as shown in fig. 3, the passing prohibition sign is displayed to indicate pedestrians and vehicles, the unmanned vehicles enter a signal sending coverage area, the road traffic interruption signals can be received, and the route can be planned reasonably again. After the construction is finished, the variable double-sided active luminous road traffic sign control switch is adjusted, the variable double-sided active luminous road traffic sign is changed and displayed, as shown in fig. 4, a crossroad sign is displayed, a crossroad in front of pedestrians and vehicles is indicated, and the luminous sign can be observed by two-way vehicles.
And 2, constructing a road in a certain road section, wherein vehicles are prohibited to enter the road section, installing the variable double-sided active light-emitting road traffic sign, lighting a signal lamp, displaying the entrance prohibition sign as shown in fig. 5, indicating that the vehicles are prohibited to pass through, enabling unmanned vehicles to enter a signal sending coverage area, receiving the road entrance prohibition signal, and reasonably planning the route again. After the construction is completed, the road section normally passes through, but the road section is forbidden to stop, the variable double-sided active luminous road traffic sign control switch is adjusted, the variable double-sided active luminous road traffic sign is changed and displayed, as shown in fig. 6, a stop forbidden sign is displayed to indicate that pedestrians and vehicles pass through, but the stop is forbidden, and the luminous sign can be observed by two-way incoming vehicles.
The invention is not the best known technology.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (9)
1. A variable double-sided active light-emitting road traffic sign is characterized by comprising a double-sided light-emitting circuit board, a transparent plate, a control unit, a frame and a support, wherein the transparent plate, the double-sided light-emitting circuit board and the transparent plate are arranged in the frame in sequence, and the frame and the control unit are arranged on the support;
have on the two-sided luminous circuit board and run through the aperture of two-sided luminous circuit board, in the aperture with two-sided luminous circuit board horizontal direction unanimously places a plurality of positive pole pins, a negative pole pin, a plurality of wafers of negative pole pin side welding, positive pole pin place in around the negative pole pin, use the gold thread to connect the wafer with positive pole pin encapsulates this region with epoxy, and two sides of two-sided luminous circuit board form the arch.
2. The negative electrode pin according to claim 1, wherein the top end of the negative electrode pin is T-shaped, and the side surface of the negative electrode pin is used for welding the wafer.
3. The wafer of claim 2, wherein the number of the wafers is 2, the wafers are welded to two sides of the T-shaped structure, and the light emitting angle of each wafer is close to 180 degrees.
4. The positive electrode pin according to claim 1, wherein the number of the positive electrode pins is 2, the positive electrode pins are placed on two sides of the T-shaped structure, and the top end of each positive electrode pin is slightly lower than the horizontal line of the lower edge of the wafer.
5. The positive electrode lead according to claim 4, wherein the positive electrode leads are in one-to-one correspondence with the wafers and are connected by the gold wire.
6. The positive and negative electrode pins of claims 2-5, wherein a plurality of the positive and negative electrode pins are uniformly positioned and all have no contact.
7. The epoxy resin of claim 1, wherein the epoxy resin is transparent, a large amount of scattering agent is mixed, and hemispherical protrusions are formed on both sides of the double-sided light emitting circuit board to form lenses.
8. The double-sided light-emitting circuit board of claim 1, wherein a plurality of light-emitting points are present on the double-sided light-emitting circuit board, and when the double-sided light-emitting circuit board is partially or completely lighted, a plurality of patterns are formed, and the patterns are visible on both sides.
9. The control unit of claim 1, wherein the control unit is capable of adjusting the pattern of the variable double-sided actively illuminated road traffic sign on the one hand and of transmitting the current variable double-sided actively illuminated road traffic sign status on the other hand: the current display pattern can be sent to the user side, whether the current display pattern has abnormal states or not can be sent to the unmanned automobile, and the current indication information can also be sent to the unmanned automobile.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210389273.4A CN114606880A (en) | 2022-04-14 | 2022-04-14 | Variable double-sided active luminous road traffic sign |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210389273.4A CN114606880A (en) | 2022-04-14 | 2022-04-14 | Variable double-sided active luminous road traffic sign |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114606880A true CN114606880A (en) | 2022-06-10 |
Family
ID=81868715
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210389273.4A Pending CN114606880A (en) | 2022-04-14 | 2022-04-14 | Variable double-sided active luminous road traffic sign |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114606880A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2509675Y (en) * | 2001-09-19 | 2002-09-04 | 林锡煌 | Illuminating diode display device with double-side illuminating |
| CN1804955A (en) * | 2005-12-28 | 2006-07-19 | 陈晓锋 | Two-side pixel display lamp for advertisement and information display |
| CN200947435Y (en) * | 2006-09-20 | 2007-09-12 | 南京工业大学 | LED for wide irradiation angle illumination |
| CN201081169Y (en) * | 2007-09-28 | 2008-07-02 | 大连世纪长城光电科技有限公司 | Dual-side LED lamp |
| CN205028609U (en) * | 2015-09-18 | 2016-02-10 | 中山市诚睿广告制品有限公司 | Double-sided advertising board |
| KR20180059223A (en) * | 2016-11-25 | 2018-06-04 | 주식회사 솔루팜 | A framed advertising device using transparent led film |
| CN210797343U (en) * | 2019-05-27 | 2020-06-19 | 湖南湘旭交安光电高科技股份有限公司 | Double-sided luminous sign for road traffic |
| CN218175656U (en) * | 2022-04-13 | 2022-12-30 | 维特瑞交通科技有限公司 | Variable double-sided active luminous road traffic sign |
-
2022
- 2022-04-14 CN CN202210389273.4A patent/CN114606880A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2509675Y (en) * | 2001-09-19 | 2002-09-04 | 林锡煌 | Illuminating diode display device with double-side illuminating |
| CN1804955A (en) * | 2005-12-28 | 2006-07-19 | 陈晓锋 | Two-side pixel display lamp for advertisement and information display |
| CN200947435Y (en) * | 2006-09-20 | 2007-09-12 | 南京工业大学 | LED for wide irradiation angle illumination |
| CN201081169Y (en) * | 2007-09-28 | 2008-07-02 | 大连世纪长城光电科技有限公司 | Dual-side LED lamp |
| CN205028609U (en) * | 2015-09-18 | 2016-02-10 | 中山市诚睿广告制品有限公司 | Double-sided advertising board |
| KR20180059223A (en) * | 2016-11-25 | 2018-06-04 | 주식회사 솔루팜 | A framed advertising device using transparent led film |
| CN210797343U (en) * | 2019-05-27 | 2020-06-19 | 湖南湘旭交安光电高科技股份有限公司 | Double-sided luminous sign for road traffic |
| CN218175656U (en) * | 2022-04-13 | 2022-12-30 | 维特瑞交通科技有限公司 | Variable double-sided active luminous road traffic sign |
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