CN115331423A - Roadside equipment for reducing safety risk of entrance and exit tunnel portal and guidance passing system - Google Patents
Roadside equipment for reducing safety risk of entrance and exit tunnel portal and guidance passing system Download PDFInfo
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- CN115331423A CN115331423A CN202210720569.XA CN202210720569A CN115331423A CN 115331423 A CN115331423 A CN 115331423A CN 202210720569 A CN202210720569 A CN 202210720569A CN 115331423 A CN115331423 A CN 115331423A
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/01—Detecting movement of traffic to be counted or controlled
- G08G1/0104—Measuring and analyzing of parameters relative to traffic conditions
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/01—Detecting movement of traffic to be counted or controlled
- G08G1/017—Detecting movement of traffic to be counted or controlled identifying vehicles
- G08G1/0175—Detecting movement of traffic to be counted or controlled identifying vehicles by photographing vehicles, e.g. when violating traffic rules
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/09—Arrangements for giving variable traffic instructions
- G08G1/0962—Arrangements for giving variable traffic instructions having an indicator mounted inside the vehicle, e.g. giving voice messages
- G08G1/0967—Systems involving transmission of highway information, e.g. weather, speed limits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/12—Protocols specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/18—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast
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Abstract
The invention provides roadside equipment and a traffic guidance system for reducing the safety risk of entering and exiting a tunnel entrance. The roadside equipment comprises a forward visual angle camera, a remote server and vehicle-mounted communication equipment; the two groups of forward visual angle cameras are respectively arranged at the tunnel inlet and the tunnel outlet and are in wireless data transmission connection with the remote server; the remote server is internally provided with a road condition analysis unit, a coding and decoding unit, a network communication unit and a first wireless communication unit; the road condition analysis unit is used for analyzing the road condition according to the received road condition video and generating a tunnel entrance and exit guidance passing voice packet; the coder-decoder is used for compressing the video shot by the forward visual angle camera; a GPS positioning unit, a video playing unit, a voice broadcasting unit and a second wireless communication unit are arranged in the vehicle-mounted communication equipment. The invention can reduce the safety risk of vehicles entering and exiting the tunnel entrance, and the vehicles can avoid in advance, thereby effectively improving the vehicle passing efficiency in the tunnel.
Description
Technical Field
The invention belongs to the field of roadside equipment, and particularly relates to roadside equipment and a traffic guidance system for reducing safety risks of entering and exiting a tunnel portal.
Background
Along with the development of wireless information technology, the auxiliary driving content is more and more comprehensive, through functions such as satellite shooting positioning, the road condition query of the road surface exposed outside is simple and convenient, but the road condition query of the tunnel portal still has certain problems, for example, the problem of poor satellite signal stability, the sight brightness of the vehicle is suddenly changed when the vehicle drives in and out of the tunnel portal, the road condition when the vehicle drives in and out of the tunnel portal is difficult to grasp, the driver can only overcome the problems by means of own driving technology, and certain influence is caused on the driving safety of the driver.
Disclosure of Invention
In order to solve the problem that vehicles in the prior art have large potential safety hazards when driving into and out of a tunnel entrance, the invention provides roadside equipment and a traffic guidance system for reducing the safety risk of entering and exiting the tunnel entrance.
In order to achieve the aim of the invention, the roadside equipment for reducing the safety risk of entering and exiting the tunnel entrance is provided by the invention,
the system comprises a forward visual angle camera, a remote server and vehicle-mounted communication equipment;
the system comprises a remote server, two groups of forward visual angle cameras, a tunnel entrance and a tunnel exit, wherein the two groups of forward visual angle cameras are respectively arranged at the tunnel entrance and the tunnel exit and are respectively used for shooting road conditions in the tunnel entrance and road conditions outside the tunnel exit to obtain road condition videos;
the remote server is internally provided with a road condition analysis unit, an encoding and decoding unit, a network communication unit and a first wireless communication unit, wherein the encoding and decoding unit is used for compressing road condition videos shot by the forward visual angle camera and further generating accessible streaming media by the network communication unit;
vehicle communication equipment is used for setting up in the vehicle, set up GPS positioning unit in the vehicle communication equipment, the video broadcast unit, voice broadcast unit and second wireless communication unit, GPS positioning unit is used for fixing a position the vehicle position, second wireless communication unit and first wireless communication unit wireless communication connect, the vehicle is before getting into the tunnel portal and roll off the tunnel portal in the automatic broadcast tunnel portal of vehicle communication equipment with the outer road conditions video of tunnel exit, the voice broadcast unit is used for cooperating the road conditions video to guide current the explanation simultaneously.
Preferably, the road condition analysis performed by the road condition analysis unit includes any one or more of whether a fault or maintenance exists on the road, whether a traffic accident exists in the photographed video area, and a traffic congestion degree in the photographed video area.
Preferably, the traffic jam degree is divided into smooth, orderly driving and slow driving.
Preferably, the content in the tunnel entrance and exit guidance traffic voice packet includes any one or more of a warning of a road fault or maintenance, a warning of an existing traffic accident, and a warning of traffic efficiency.
Preferably, the reminding of the road fault or repair and the reminding of the existing traffic accident are accurate to the affected specific lane, such as the repair of the second right lane or the occurrence of the traffic accident in the second right lane, and please avoid in advance.
Preferably, the vehicle-mounted communication equipment starts to automatically play the road condition videos inside the tunnel entrance and outside the tunnel exit when the vehicle enters and exits the tunnel entrance by five hundred meters, and the voice broadcasting unit is matched with the road condition videos to guide traffic commentary.
Preferably, the vehicle-mounted communication equipment comprises an equipment shell, a display screen, a loudspeaker and a main switch; the display screen and the loudspeaker are arranged on the equipment shell, the display screen is used for playing compressed road condition videos, and the loudspeaker is used for voice broadcasting for guiding passing in and out of the tunnel; the main switch is arranged on the equipment shell and used for controlling the on-board communication equipment to work and close.
Preferably, the equipment shell is also provided with a video playing control button and a voice broadcasting control button; the video playing control button is used for controlling the work and the closing of the display screen, and the voice broadcasting control button is used for controlling the work and the closing of the loudspeaker.
The invention also provides a vehicle entrance and exit tunnel entrance guiding and passing system which comprises the roadside equipment for reducing the safety risk of entrance and exit tunnel entrance.
Compared with the prior art, the invention has at least the following beneficial technical effects:
through the video of the road condition inside and outside the tunnel export of preceding visual angle camera real-time shooting tunnel entrance, then upload the video to remote server, form the video that can supply vehicle-mounted communication equipment to look over after the compression, and carry out the analysis to the video of shooing and draw the current relevant suggestion of guidance, be convenient for the driver to know near road condition information in the tunnel before the vehicle drives into the tunnel and acquire the current suggestion of guidance, be convenient for simultaneously the driver to know near road condition information outside the tunnel and acquire the current suggestion of guidance before the vehicle drives out the tunnel, the safety risk of vehicle discrepancy tunnel mouth has effectively been reduced, and the vehicle dodges in advance, can effectively improve the current efficiency of vehicle in the tunnel.
Drawings
In order to illustrate embodiments of the invention or solutions in the prior art more clearly, the drawings that are needed in the description of the embodiments or solutions in the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the invention, and for a person skilled in the art, without inventive effort, other drawings may be obtained from these drawings, in which:
fig. 1 is a schematic connection diagram of a forward-looking camera, a remote server and a vehicle-mounted communication device in an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of an in-vehicle communication apparatus;
fig. 3 is a schematic structural diagram of roadside equipment for reducing the security risk of entering and exiting a tunnel portal according to an embodiment of the present invention.
Reference numerals: 1. a forward view camera; 2. a remote server; 3. an in-vehicle communication device; 31. a display screen; 32. a speaker; 33. a master switch; 34. a video play control button; 35. voice broadcast control button.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be understood that although the terms first, second, etc. may be used herein to describe various information in one or more embodiments of the specification, these information should not be limited by these terms, which are used only for distinguishing between similar items and not necessarily for describing a sequential or chronological order of the features described in one or more embodiments of the specification. Furthermore, the terms "having," "including," and similar referents, are intended to cover a non-exclusive scope, such that a process, method, system, article, or apparatus that comprises a list of steps or modules is not necessarily limited to the particular details set forth, but may include other inherent information not expressly listed for such steps or modules.
Example one
As shown in fig. 1, the roadside device for reducing the security risk of entering and exiting a tunnel portal provided by the invention comprises a forward direction view camera 1, a remote server 2 and an on-board communication device 3.
The two groups of forward visual angle cameras 1 are arranged, wherein the two groups of forward visual angle cameras 1 are respectively arranged at a tunnel inlet and a tunnel outlet, the two groups of forward visual angle cameras 1 are respectively used for shooting road conditions in the tunnel inlet and outside the tunnel outlet to obtain road condition videos, and the two groups of forward visual angle cameras 1 are both in wireless data transmission connection with the remote server 2;
the remote server 2 is internally provided with a road condition analysis unit, a coding and decoding unit, a network communication unit and a first wireless communication unit. The encoding and decoding unit is used for compressing the road condition video shot by the forward visual angle camera 1, and the network communication unit further generates an accessible streaming media; the road condition analysis unit is used for analyzing the road condition according to the received road condition video, generating a passing voice packet for guiding the passing in and out of the tunnel, and synchronously sending the compressed video to the vehicle-mounted communication equipment 3 in a matching manner. And the road condition analysis is carried out, so that the driver can avoid the jammed lane in advance, and the vehicle passing efficiency of the entrance and the exit of the tunnel can be improved.
The vehicle-mounted communication device 3 is arranged in a vehicle, and a GPS positioning unit, a video playing unit, a voice broadcasting unit and a second wireless communication unit are arranged in the vehicle-mounted communication device 3. The GPS positioning unit is used for positioning the position of the vehicle; the first wireless communication unit is in wireless communication connection with the second wireless communication unit, the vehicle-mounted communication equipment 3 automatically plays road condition videos in a tunnel entrance and outside the tunnel exit before entering the tunnel entrance and exiting the tunnel entrance, and the voice broadcasting unit is used for guiding traffic explanation in cooperation with the road condition videos.
Preferably, in this embodiment, the vehicle-mounted communication device 3 starts to automatically play the traffic videos inside and outside the tunnel entrance when the vehicle enters and exits the tunnel entrance by five hundred meters, and the voice broadcasting unit cooperates with the traffic videos to guide traffic commentary.
In this embodiment, shoot the road conditions video in the tunnel entrance and outside the tunnel export in real time through preceding visual angle camera 1, then upload the road conditions video to remote server 2, form the video that can supply on-vehicle communication equipment 3 to look over after compressing, and carry out the analysis to the video of shooing and draw the relevant suggestion of guiding to pass, be convenient for the driver know near road conditions information in the tunnel before the vehicle drives into the tunnel and acquire the suggestion of guiding to pass, be convenient for the driver know near road conditions information outside the tunnel and acquire the suggestion of guiding to pass before the vehicle drives out the tunnel, the safety risk of vehicle discrepancy tunnel has effectively been reduced.
Example two
As shown in fig. 1, the roadside device for reducing the security risk of entering and exiting a tunnel entrance provided by the present embodiment includes a forward direction view camera 1, a remote server 2 and an on-board communication device 3.
The two groups of forward visual angle cameras 1 are arranged, wherein the two groups of forward visual angle cameras 1 are respectively arranged at a tunnel inlet and a tunnel outlet, the two groups of forward visual angle cameras 1 are respectively used for shooting road conditions in the tunnel inlet and outside the tunnel outlet to obtain road condition videos, and the two groups of forward visual angle cameras 1 are both in wireless data transmission connection with the remote server 2;
the remote server 2 is internally provided with a road condition analysis unit, a coding and decoding unit, a network communication unit and a first wireless communication unit. The encoding and decoding unit is used for compressing the road condition video shot by the forward visual angle camera 1, and the network communication unit further generates an accessible streaming media; the road condition analysis unit is used for analyzing the road condition according to the received road condition video, generating a passing voice packet for guiding the passing in and out of the tunnel, and synchronously sending the compressed video to the vehicle-mounted communication equipment 3 in a matching manner. And the road condition analysis is carried out, so that the driver can avoid the jammed lane in advance, and the vehicle passing efficiency of the entrance and the exit of the tunnel can be improved.
The vehicle-mounted communication equipment 3 is arranged in a vehicle, and a GPS positioning unit, a video playing unit, a voice broadcasting unit and a second wireless communication unit are arranged in the vehicle-mounted communication equipment 3. The GPS positioning unit is used for positioning the position of the vehicle; the first wireless communication unit is in wireless communication connection with the second wireless communication unit, the vehicle-mounted communication equipment 3 automatically plays road condition videos in a tunnel entrance and outside the tunnel exit before entering the tunnel entrance and exiting the tunnel entrance, and the voice broadcasting unit is used for guiding traffic explanation in cooperation with the road condition videos.
The road condition analysis unit analyzes the road conditions, wherein the road condition analysis unit analyzes whether a road has a fault or is maintained, whether a traffic accident exists in the shot video area or not, and the traffic congestion degree in the shot video area, wherein the traffic congestion degree is divided into smooth traffic, ordered driving and slow driving.
The contents in the tunnel entrance and exit guidance passing voice packet comprise any one or more of a reminding of road faults or maintenance, a reminding of existing traffic accidents and a reminding of passing efficiency. The reminding of road faults or maintenance and the reminding of existing traffic accidents are accurate to the affected specific lane, for example, the right second lane is maintained or the traffic accidents happen to the right second lane, and the driver is required to avoid in advance.
In this embodiment, the driver can learn the road condition information in the tunnel entrance and outside the tunnel exit and receive the suggestion of guiding traffic before going into and going out of the tunnel, and the driver safe driving of being convenient for has reduced the safe risk that the vehicle came in and out of the tunnel entrance, and the vehicle dodges in advance, can effectively improve the current efficiency of vehicle in the tunnel.
EXAMPLE III
As shown in fig. 3, the roadside device for reducing the security risk of entering and exiting a tunnel portal according to the present invention includes a forward-looking camera 1, a remote server 2 and an onboard communication device 3.
The two groups of forward visual angle cameras 1 are arranged, wherein the two groups of forward visual angle cameras 1 are respectively arranged at a tunnel inlet and a tunnel outlet, the two groups of forward visual angle cameras 1 are respectively used for shooting road conditions in the tunnel inlet and outside the tunnel outlet to obtain road condition videos, and the two groups of forward visual angle cameras 1 are both in wireless data transmission connection with the remote server 2;
the remote server 2 is internally provided with a road condition analysis unit, a coding and decoding unit, a network communication unit and a first wireless communication unit. The encoding and decoding unit is used for compressing the road condition video shot by the forward visual angle camera 1, and the network communication unit further generates an accessible streaming media; the road condition analysis unit is used for analyzing the road condition according to the received road condition video, generating a passing voice packet for guiding the passing in and out of the tunnel, and synchronously sending the compressed video to the vehicle-mounted communication equipment 3 in a matching way. And the road condition analysis is carried out, so that the driver can avoid the jammed lane in advance, and the vehicle passing efficiency of the entrance and the exit of the tunnel can be improved.
The vehicle-mounted communication equipment 3 is arranged in a vehicle, and a GPS positioning unit, a video playing unit, a voice broadcasting unit and a second wireless communication unit are arranged in the vehicle-mounted communication equipment 3. The GPS positioning unit is used for positioning the vehicle position; the first wireless communication unit is in wireless communication connection with the second wireless communication unit, the vehicle-mounted communication equipment 3 automatically plays road condition videos in a tunnel entrance and outside the tunnel exit before entering the tunnel entrance and exiting the tunnel entrance, and the voice broadcasting unit is used for guiding traffic explanation in cooperation with the road condition videos.
The vehicle-mounted communication device 3 comprises a device shell, a display screen 31, a loudspeaker 32 and a main switch 33; the display screen 31 and the loudspeaker 32 are both arranged on the equipment shell, the display screen 31 is used for playing road condition videos compressed by the coding and decoding unit in the remote server 2, and the loudspeaker 32 is used for voice broadcasting for guiding passing in and out of the tunnel; a main switch 33 is provided on the apparatus casing, and the main switch 33 is used to control the operation and the off of the in-vehicle communication apparatus 3.
In this embodiment, the device housing is further provided with a video playing control button 34 and a voice broadcasting control button 35; video play control buttons 34 are used to control the operation and shutdown of display screen 31, and voice broadcast control buttons 35 are used to control the operation and shutdown of speaker 32.
In this embodiment, the personnel in the vehicle can watch the road conditions video through display screen 31 to broadcast the business turn over tunnel through speaker 32 and guide the suggestion of passing, and the personnel in the vehicle can also select the mode of receiving information according to video broadcast control button 34 and voice broadcast control button 35, go into and can select only to watch the video, only listen to voice broadcast or both go on simultaneously.
Example four
On the basis of the foregoing embodiments, the present embodiment provides a vehicle entrance and exit tunnel entrance guidance passage system to guide the passage of a vehicle. The system comprises the roadside equipment which is provided by the embodiment and used for reducing the safety risk of entering and exiting the tunnel entrance. The roadside equipment comprises two groups of forward visual angle cameras 1, a remote server 2 and vehicle-mounted communication equipment 3; the remote server 2 is internally provided with a road condition analysis unit, an encoding and decoding unit, a network communication unit and a first wireless communication unit; a GPS positioning unit, a video playing unit, a voice broadcasting unit and a second wireless communication unit are arranged in the vehicle-mounted communication equipment 3.
In this embodiment, instruct current system to shoot the interior road conditions video outside with the tunnel export of tunnel entrance in real time through two sets of preceding visual angle cameras 1, then upload the video to remote server 2, form the video that can supply on-vehicle communication equipment 3 to look over after compressing, and carry out the analysis to the video of shooing and draw the relevant suggestion of instructing to pass, be convenient for the driver know near road conditions information in the tunnel entrance and acquire the suggestion of instructing to pass before the vehicle drives into the tunnel entrance, be convenient for the driver to know near road conditions information outside the tunnel entrance and acquire the suggestion of instructing to pass before the vehicle drives out the tunnel entrance simultaneously, the safety risk of vehicle access tunnel entrance has effectively been reduced, and can effectively avoid the jam of tunnel entrance.
The embodiments of the present invention have been described in detail with reference to the drawings, but the present invention is not limited thereto, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.
Claims (10)
1. Roadside equipment for reducing the safety risk of entering and exiting a tunnel entrance is characterized by comprising a forward visual angle camera (1), a remote server (2) and vehicle-mounted communication equipment (3);
the method comprises the following steps that two groups of forward visual angle cameras (1) are arranged, the two groups of forward visual angle cameras (1) are respectively installed at a tunnel inlet and a tunnel outlet, the two groups of forward visual angle cameras (1) are respectively used for shooting road conditions in the tunnel inlet and outside the tunnel outlet to obtain road condition videos, and the two groups of forward visual angle cameras (1) are connected with a remote server (2) in a wireless data transmission mode;
the remote server (2) is internally provided with a road condition analysis unit, an encoding and decoding unit, a network communication unit and a first wireless communication unit, wherein the encoding and decoding unit is used for compressing road condition videos shot by the forward visual angle camera (1), and the network communication unit further generates stream media for access, the road condition analysis unit is used for analyzing road conditions according to the received road condition videos, generating a tunnel entrance and exit guide passing voice packet, and synchronously transmitting the compressed videos to the vehicle-mounted communication equipment (3);
vehicle communication equipment (3) are used for setting up in the vehicle, set up GPS positioning unit in vehicle communication equipment (3), the video broadcast unit, voice broadcast unit and second wireless communication unit, GPS positioning unit is used for fixing a position the vehicle position, second wireless communication unit and first wireless communication unit wireless communication connect, the vehicle is before getting into the tunnel portal and roll off out of the tunnel portal vehicle communication equipment (3) automatic broadcast tunnel entry and the outer road conditions video of tunnel exit, the voice broadcast unit is used for cooperating the road conditions video to guide current explanation simultaneously.
2. The roadside apparatus for reducing the safety risk of entering and exiting the tunnel portal according to claim 1, wherein the road condition analysis unit makes road condition analysis including any one or more of whether a road is in failure or in maintenance, whether a traffic accident exists in the video area, and the degree of traffic congestion in the video area.
3. The roadside apparatus reducing the safety risk of entry into and exit from a tunnel portal of claim 1 wherein the degree of traffic congestion is divided into clear, orderly and slow traffic.
4. The roadside apparatus for reducing the safety risk of entering and exiting a tunnel portal according to claim 1, wherein the content in the entering and exiting tunnel guidance traffic voice packet comprises any one or more of a reminder of a road fault or repair, a reminder of an existing traffic accident and a reminder of traffic efficiency.
5. Roadside equipment to reduce the risk of entry and exit from the tunnel portal safety as claimed in claim 4 where the alerts for road faults or repairs and alerts for existing traffic accidents are accurate to the specific lane affected.
6. The roadside equipment for reducing the safety risk of entering and exiting the tunnel entrance as recited in claim 1, wherein the vehicle starts to automatically play the video of the road conditions in the tunnel entrance five hundred meters before entering the tunnel entrance, and the voice broadcasting unit cooperates with the video of the road conditions to guide the traffic commentary.
7. The roadside apparatus for reducing the safety risk of entering and exiting the tunnel portal according to claim 1, wherein the vehicle-mounted communication apparatus (3) starts to play the video of the road condition outside the tunnel portal when the vehicle exits from the tunnel portal by five hundred meters, and meanwhile, the voice broadcasting unit cooperates with the video of the road condition to guide the traffic commentary.
8. Roadside equipment to reduce the access tunnel portal security risk according to any of the claims 1-7, characterized by the vehicle-mounted communication equipment (3) including equipment housing, display screen (31), speakers (32) and master switch (33); the display screen (31), the loudspeaker (32) and the master switch (33) are arranged on the equipment shell, the display screen (31) is used for playing compressed road condition videos, the loudspeaker (32) is used for conducting voice broadcasting for guiding passing in and out of the tunnel, and the master switch (33) is used for controlling the work and the closing of the vehicle-mounted communication equipment (3).
9. The roadside apparatus for reducing the safety risk of entering and exiting the tunnel portal according to claim 8, wherein a video playing control button (34) and a voice broadcasting control button (35) are further arranged on the apparatus casing; the video playing control button (34) is used for controlling the operation and the closing of the display screen (31), and the voice broadcasting control button (35) is used for controlling the operation and the closing of the loudspeaker (32).
10. A vehicle entrance and exit tunnel entrance guidance passage system comprising the roadside apparatus as recited in any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210720569.XA CN115331423A (en) | 2022-06-23 | 2022-06-23 | Roadside equipment for reducing safety risk of entrance and exit tunnel portal and guidance passing system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210720569.XA CN115331423A (en) | 2022-06-23 | 2022-06-23 | Roadside equipment for reducing safety risk of entrance and exit tunnel portal and guidance passing system |
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| CN115331423A true CN115331423A (en) | 2022-11-11 |
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| CN202210720569.XA Pending CN115331423A (en) | 2022-06-23 | 2022-06-23 | Roadside equipment for reducing safety risk of entrance and exit tunnel portal and guidance passing system |
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