JPH06119803A - Illumination method for expressway tunnel - Google Patents

Abstract

PURPOSE:To provide an illumination method for the inside of an expressway tunnel having the capability of preventing visual hindrance and dazzling for a driver by applying the constitution where a beam from each lighting illuminant separately arranged in the tunnel is projected with directivity only in a vehicle travel direction. CONSTITUTION:Each of lighting illuminants 2 sequentially laid at the predetermined distance on walls 1a and 1b at both sides of a tunnel, are made to have directivity for illumination in a vehicle travel direction, so that the illuminants 2 do not come in the direct view of a person on board a vehicle, regardless of a travel lane. Also, the light quantity and installation intervals of each illuminant 2 are so determined that the vehicle travel direction is illuminated approximately evenly and a road in the tunnel can be properly recognized. In addition, a lane division sign 5 is made in such a way as capable of generating a continuous lane separation line with a continuous recurrent reflecting zone.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for illuminating a one-way highway tunnel without an oncoming lane.

[0002]

2. Description of the Related Art Lighting in a conventional highway tunnel is
As shown in (a) of FIG. 1, the illumination light source 20 is sequentially installed on the wall surface 10 or the ceiling surface 10 in the tunnel with a predetermined distance from each other on the wall surfaces 10 on both sides of the tunnel while being exposed. It irradiates the road surface with 90 ° or more diffused in the front and back (see Fig. 1 (a)) and up and down (see Fig. 1 (b)).

[0003]

However, when the cars 30a and 30b travel at high speed in the illuminated tunnel as described above, when the cars 30a and 30b pass through the points of the individual illumination light sources, the eyes of the occupant, especially the driver, may be affected. The light source intermittently enters, and the driver is forced to "blink" depending on the traveling speed of the vehicle and the distance between the illumination light sources.

Further, intermittent reflected light is also noticeable from lane separation signs (cat's eyes, etc.) 40 which separate the traveling lanes on the road surface in the tunnel.

Under such a condition, a tired driver or an elderly driver whose optic nerve reaction is slow is likely to be unable to catch up with intermittent blinking of light, which causes discomfort. In some cases it can cause visual impairment and dazzling
Dazzling can lead to serious accidents in the tunnel.

Therefore, an object of the present invention is to prevent the driver's eyes from being dazzled by the flickering of the illumination light sources, which are sequentially installed on the wall surfaces on both sides of the tunnel, at a predetermined distance from each other, so that the driver does not feel uncomfortable due to flicker. To get the road tunnel lighting method.

In order to achieve this object, the highway tunnel lighting method according to the present invention determines which lane the vehicle is traveling in on each of the illumination light sources sequentially installed on the wall surfaces on both sides of the tunnel at a predetermined distance from each other. In addition, a person in a car should have a directivity that illuminates the traveling direction of the vehicle so that the illumination light source does not come into direct contact with the eyes, and the light intensity and installation interval of the illumination light source are almost uniform in the traveling direction of the vehicle. It is characterized in that the amount of light and the installation interval are set so that the road surface in the tunnel can be visually recognized with certainty.

In addition, continuous retroreflective bands are used for lane separation signs on the road surface in highway tunnels.

[0009]

According to the method of the present invention, when a vehicle travels in a tunnel, the light source does not directly enter the field of view even when passing through the individual illumination light sources, so that the illumination light sources are dazzled by flicker. Never.

Further, by using the retroreflective band in which the lane separation signs are continuous, the lane separation lines can be seen continuously and the illusion caused by intermittent reflection can be prevented.

[0011]

The preferred embodiments of the present invention will now be described with reference to the drawings.

FIG. 2 (a) shows the directivity of the luminous flux projected by the illumination light source installed in the highway tunnel by the method of the present invention. FIG. 2B shows a state viewed from the entrance of the highway tunnel. According to the method of the present invention, each of the illumination light sources 2 sequentially installed on the wall surfaces 1a, 1b on both sides of the tunnel at a predetermined distance apart from each other, is mounted on the vehicle regardless of which lane the vehicles 3a, 3b are traveling. A person, especially a driver, should have a directivity that illuminates the direction of travel of the vehicle so that the illumination light source does not come into direct contact with the eyes. In addition, the amount of light and the installation interval are set so that the road surface in the tunnel can be reliably viewed.

In a preferred embodiment, the divergence of the luminous flux directed in the traveling direction of each illumination light source 2 is set to 45 ° or less toward the inside of the road as measured from the wall surface.

The illuminating light source shown in FIG. 2 shows an embodiment in which the illuminating light source having no directivity is made to have the above-mentioned directivity by the shield 4. However, the illuminating light source having the above-mentioned directivity may be used. it can.

As shown in FIG. 2, according to the method of the present invention,
A continuous retroreflection band is used for the lane separation sign 5.

[0016]

According to the method for illuminating a highway tunnel of the present invention, no matter which lane the vehicle is traveling in, the direction of travel of the vehicle is controlled so that the illuminating light source is not directly visible to the person in the vehicle. The lighting source has a directivity, and the light intensity and the installation interval of the illumination light source are set so that the traveling direction of the vehicle can be illuminated almost uniformly and the road surface in the tunnel can be reliably viewed. When passing through the light source,
The light source does not intermittently enter the eyes of the driver, which does not cause discomfort, visual impairment or dazzling to the driver, and enables comfortable driving in the tunnel.

Further, if a lane separation sign in a highway tunnel is also used with a continuous retroreflective band, it appears to the driver as a continuous lane separation line, and the illusion of flicker like the conventional separation signs. Will not be given to the driver.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a lighting condition in a conventional highway tunnel, where (a) is a top view of a state in which a truck and a passenger car are traveling in the tunnel, and (b) is a view from a highway tunnel entrance. FIG. 3 is a rear view of the vehicle seen.

FIG. 2 is an explanatory view showing a lighting situation in a highway tunnel by the method for illuminating a highway tunnel according to the present invention, FIG. 2A is a top view showing a state where a truck and a passenger car are traveling in the tunnel, and FIG. [Fig. 3] is a rear view of the vehicle seen from the entrance of the expressway tunnel.

[Explanation of symbols]

 1a, 1b Tunnel wall surface 2 Illumination light source 3a, 3b Car 4 Shield 5 Lane separation sign

Claims (3)

[Claims] 1. A method of illuminating a one-way highway tunnel without an oncoming lane, in which lane the vehicle drives each of the illumination light sources which are sequentially installed on the wall surfaces on both sides of the tunnel at a predetermined distance from each other. However, a person in the car should have directivity to illuminate the traveling direction of the vehicle so that the illumination light source does not come into direct contact with the eyes, and the amount of light and the installation interval of the illumination light source should be approximately equal to the traveling direction of the vehicle. An illumination method for a highway tunnel, characterized in that the amount of light and the installation intervals are set so that the road surface in the tunnel can be reliably viewed. 2. The opening of the luminous flux directed in the traveling direction of each of the illumination light sources is 45 ° toward the inside of the road measured from the wall surface.
The highway tunnel illumination method according to claim 1, wherein: 3. The highway tunnel lighting method according to claim 1, wherein a continuous retroreflective band is used for a lane separation sign on a road surface in the highway tunnel.