bhz978p6p
19.04.2011, 03:00
Like to see in bright environments the phenomenon of black holes is called the black hole phenomenon. Once the black hole phenomenon, with the vehicle close to the tunnel, shortening the distance the driver's visibility and can not drive safely. The black hole phenomenon is occurring before entering the tunnel vision problem is the tunnel lighting, the most important issue.
To prevent the occurrence of the black hole phenomenon, starting from the tunnel entrance in a distance sufficient intensity to ensure that this part of the length of braking distance than the safety of motor vehicles slightly longer. Entering the tunnel, because there is a big inside and outside the brightness difference, adaptation of the delay, the driver can not adapt quickly channel the visual brightness, it is difficult to see the interior of the tunnel.
To prevent this from happening, should enable the tunnel entrance brightness decreased slowly with the degree of visual adaptation and brightness to a smooth transition should be gradual to reduce the brightness, but before and after the brightness level brightness level is worth more than 3:1 ratio, and 2m high Following the brightness of the wall surface can not be lower than the average brightness.
2. Through the tunnel problems arising in the course of brightness in the tunnel during the day than at night street lighting, high brightness, the brightness at night than during the day low. Large traffic flow, consider the long tunnel in the car exhaust emissions, then because of the formation of exhaust fumes can not be quickly dissipated, the light absorption and scattering,electric signs (http://www.advertiseall.com/), reduces visibility, leaving the visual identification difficult, the front lights influenced by vehicle exhaust, can not satisfy the legibility necessary, the road 100m in front of half brightness, usually 2 times the brightness of road lighting effects to make up for gas. The following picture shows the increase in jet fan to improve the air inside the tunnel.
3. Close to the tunnel exit problem when watching the external brightness through the export of high export appears to be a bright hole, a serious glare, exports become a white cave,LED message board (http://www.advertiseall.com/), which is called white hole phenomenon; the background of the white hole,LED outdoor sign (http://www.advertiseall.com/), and motor vehicles became a black silhouette is easy to identify, but in a large box truck with cars and trucks behind the silhouette of coincidence is hard to see, in heavy traffic near the tunnel exit, in order to identify overlap,LED neon sign (http://www.advertiseall.com/), the size of the vehicles to do exports of lighting as lighting, exit lighting of the interval length is tens of meters.
To prevent the occurrence of the black hole phenomenon, starting from the tunnel entrance in a distance sufficient intensity to ensure that this part of the length of braking distance than the safety of motor vehicles slightly longer. Entering the tunnel, because there is a big inside and outside the brightness difference, adaptation of the delay, the driver can not adapt quickly channel the visual brightness, it is difficult to see the interior of the tunnel.
To prevent this from happening, should enable the tunnel entrance brightness decreased slowly with the degree of visual adaptation and brightness to a smooth transition should be gradual to reduce the brightness, but before and after the brightness level brightness level is worth more than 3:1 ratio, and 2m high Following the brightness of the wall surface can not be lower than the average brightness.
2. Through the tunnel problems arising in the course of brightness in the tunnel during the day than at night street lighting, high brightness, the brightness at night than during the day low. Large traffic flow, consider the long tunnel in the car exhaust emissions, then because of the formation of exhaust fumes can not be quickly dissipated, the light absorption and scattering,electric signs (http://www.advertiseall.com/), reduces visibility, leaving the visual identification difficult, the front lights influenced by vehicle exhaust, can not satisfy the legibility necessary, the road 100m in front of half brightness, usually 2 times the brightness of road lighting effects to make up for gas. The following picture shows the increase in jet fan to improve the air inside the tunnel.
3. Close to the tunnel exit problem when watching the external brightness through the export of high export appears to be a bright hole, a serious glare, exports become a white cave,LED message board (http://www.advertiseall.com/), which is called white hole phenomenon; the background of the white hole,LED outdoor sign (http://www.advertiseall.com/), and motor vehicles became a black silhouette is easy to identify, but in a large box truck with cars and trucks behind the silhouette of coincidence is hard to see, in heavy traffic near the tunnel exit, in order to identify overlap,LED neon sign (http://www.advertiseall.com/), the size of the vehicles to do exports of lighting as lighting, exit lighting of the interval length is tens of meters.