JP3131789U - Tunnel with sequence design - Google Patents

Abstract

A one-way tunnel having a side wall surface with a sequence design for notifying a change in speed limit is provided.
A sequence design 20 includes a repetitive pattern in which the width of a pitch 40 is reduced, starting 150 to 300 m before a speed change point, and the pitch width d1 on the most entrance side and the pitch on the most exit side in the pattern. The width d2 is the length (m) obtained by the equations A and B, respectively, and the pitch between the two is a pattern in which the pitch width gradually decreases. In addition, the pitch pattern 50 may change gradually.

[Selection] Figure 1

Description

  The present invention relates to a tunnel in which a side wall is provided with a sequence design for preventing accidents when there is a change in speed limit in a tunnel or in the vicinity of a tunnel exit-side wellhead.

If there is an intersection on a general road immediately after exiting the tunnel entrance, there is a possibility that vehicles that have traveled in the tunnel will not be able to decelerate sufficiently and will enter the intersection, causing traffic signals to stop and pedestrians to be at risk. Concerned. Also in the tunnel, if there is a curve or merging, there is a risk of reaching a rear-end collision if sufficient deceleration is not possible.
In order to avoid such dangers, it is indispensable to implement traffic safety measures using road signs and road markings. It may be a hindrance. In particular, tunnel space, unlike earthworks and bridges, has a special feature that its surroundings are covered with wall surfaces. Therefore, tunnel roads are alerted using a method that differs from road signs and road markings on ordinary roads. There is a need to prompt.

For example, in Patent Document 1, in order to make it easy to visually recognize the presence of a sign from a distance along the road and to improve the visibility of the tunnel from a distance in the longitudinal direction of the road. Further, in the tunnel sign that is installed at a predetermined interval with the sign surface illuminated with the sign in the tunnel approximately along the wall surface in the tunnel, the sign for the direction of a position that is approximately half the distance of the installation interval from the sign Has proposed a technique for making the light distribution of approximately 0.8 cd or more.
Japanese Patent Laid-Open No. 2002-294641

  However, since the tunnel is a narrow space, the installation of signs for traffic safety measures must be limited. Therefore, the number of signs in the tunnel is kept to a minimum. In addition, alerting the driver with a large number of signs reflects the meaning of the many signs and reflects them in the driving behavior. As a result, the psychological burden on the driver is further increased, which may cause an accident.

By the way, in recent years, attention has been paid to the concept of infrastructure development taking into consideration the sequence landscape and the application of a design with a sequence. For example, in Non-Patent Document 1, in order to promote appropriate space recognition so that a monotonous tunnel can be driven safely and comfortably, the perspective method is used, and lightness is low below the road surface and is increased in the tunnel length direction. There is disclosed a technique that can improve psychological pressure in tunnel running by using a tunnel with a sequence design that has a high brightness and a shorter pattern in the tunnel length direction above the road surface.
Katsuhiro Enomoto: About the sequence design of the Kotori Tunnel 2005 National Land Technology Research Group, Ministry of Land, Infrastructure, Transport and Tourism, 2005.10.

  Since the sequence design as described above uses the inner wall surface of the tunnel, design is possible regardless of the narrowness of the tunnel space as described above, and to the driver using the sequence design method. May call attention without increasing the psychological pressure in the tunnel.

  Therefore, in the present invention, when the tunnel destination has a change point where the speed limit is changed later than before, by using the above sequence design method, the psychological pressure in the tunnel is not increased unnecessarily, It is an object of the present invention to provide a tunnel in which a side wall surface is provided with a sequence design capable of notifying the existence of the change point and potentially calling attention to decelerate spontaneously.

As a means to solve the above problem, traveling is restricted only in one direction, so there is a tunnel entrance side and tunnel exit side, and the speed limit is up to 100m ahead in the tunnel or beyond the tunnel exit side tunnel. In a tunnel with a speed change point that is changed later,
A sequence design is applied to a part of at least one side wall surface of the tunnel, and the sequence design includes a pattern in which a plurality of pitches are arranged in the tunnel length direction. The most important feature is the pitch width reduction repeating pattern having the feature (2).
(1) The starting point of the pitch width decreasing repeating pattern exists at any point in the range of 150 to 300 m from the change point of the speed limit toward the tunnel entrance side.
(2) Among the pitch groups constituting the pitch width reduction repeating pattern, an entrance side pitch closest to the tunnel entrance side, an exit side pitch closest to the tunnel exit side in the pattern, and the entrance side pitch and the When other pitches sandwiched by the outlet side pitch are set to the intermediate position pitch,
The pitch width d1 of the inlet side pitch and the pitch width d2 of the outlet side pitch are lengths obtained by the following equations, respectively.
d1 (m) = 1000 × s1 × (t / 3600)
d2 (m) = 1000 × s2 × (t / 3600)
(However, any value selected in the range of t = 0.25 to 0.3 (seconds), s1 = speed limit to the change point (km / h), s2 = speed limit from the change point to the previous speed ( km / h))
Each pitch width d3 of the intermediate position pitch all satisfies the following inequality,
d1 ≦ d3 ≦ d2
Each pitch width d3 of the intermediate position pitch is shorter than or equal to the pitch width of the pitch adjacent to the tunnel entrance side.

  In tunnels that have the sequence design of the present invention, when passing through the pitch width reduction repeating pattern that is the feature of the present invention, a driver traveling in the tunnel feels dangerous and overspeeded when traveling at the same speed. However, if you decelerate to the speed limit ahead of the change point, the feeling of danger and overspeed will decrease, and the comfort will be improved. The effect of slowing down can be expected. As a result, it can be expected to contribute to the reduction of automobile accidents in the tunnel or near the exit-side wellhead.

  In addition, when the total number of pitches constituting the pitch width reduction repeating pattern is 26 or less, it is possible to feel a sense of danger and a sense of overspeed before getting tired of the design, and further enhance the effect of the present invention. Can do.

  Hereinafter, the present invention will be described in more detail with reference to the drawings. However, the present invention is not limited to the embodiments shown in these drawings. FIG. 1 shows the outline of the tunnel 10 in which the sequence design 20 is applied to the side wall surface according to the present invention, from the vicinity of the tunnel exit pit toward the tunnel exit side.

(tunnel)
The tunnel 10 to which the present invention can be applied is a tunnel 10 whose travel is restricted only in one direction. Even in the tunnel where the opposite lane exists, even if the sequence design of the present invention is applied only to the side wall surface near the traveling lane, not only the driver traveling in the traveling lane but also the driver traveling in the opposite lane, As long as the sequence design enters the field of view, it is difficult to apply to tunnels that can travel in both directions, or the effects that should be played are diminished.
As described above, the tunnel 10 that is the subject of the present invention is restricted in traveling in only one direction, so the concept of tunnel entrance side and tunnel exit side can be used. Therefore, in the following, when clarifying the positional relationship in the tunnel length direction, the concept of the tunnel entrance side and the tunnel exit side will be used. The positional relationship in the height direction of the tunnel 10 can be clearly expressed by the concept of up and down.

  In addition, the tunnel 10 to which the present invention can be applied is a tunnel 10 having a speed limit change point in which the speed limit is changed slower than before by 100 m ahead in the tunnel or beyond the tunnel exit side tunnel. This is because the present invention is for inducing a potential action to induce a spontaneous deceleration as a notice of the change point of the speed limit. When the speed limit is changed fast, there is no need to make a special warning, and there is a change point where the speed limit is changed slower than 100m beyond the tunnel exit side tunnel. This is because it is more effective to make a regular alert on a general road through the tunnel than the present invention.

(Sequence design)
In the tunnel 10 that satisfies the above conditions, in the present invention, the sequence design 20 is applied to at least a part of the side wall surface of the tunnel 10, but if the sequence design 20 is applied to both side walls of the tunnel 10, The effect of the device can be further enhanced.
From the effect of the present invention, it is sufficient to apply a sequence design 20 including a pitch width reduction repeating pattern 32, which will be described later, by a predetermined length from the change point of the speed limit toward the tunnel entrance side. The sequence design 20 may be applied over the entire length in the direction.

Here, the sequence design in the tunnel generally refers to a design that is applied to the wall surface of the tunnel and that is continuous in the tunnel length direction.
In the present invention, among the sequence designs 20, a design including a pitch width reduction repeating pattern 32 to be described later is used as a part thereof.

  The height of the sequence design 20 used in the present invention is not particularly limited, but is particularly effective when it is 2.0 to 4.0 m. In the results of the questionnaire survey detailed below, when asked for answers about overspeed, danger, and comfort for heights of 1m and 2.5m, the height of 1m is higher than that of 2.5m. This is because overspeeding and less danger were obtained. On the other hand, if the sequence design is provided with a height exceeding 4.0 m, the tunnel is likely to be filled with the pattern 50, and driving comfort may be lost.

(Pitch width reduction repeating pattern)
The pattern 50 that is visible on both side walls of the tunnel 10 in FIG. 1 is a pitch width decreasing repeating pattern in the sequence design 20. A specific aspect of the pitch width reduction repeating pattern 32 is also shown in FIG. 3E.

  Here, the pitch is a fixed section (pitch width × pitch height) with a pattern, and is an element constituting a pattern used for sequence design. However, when the pattern is a repetitive pattern design, the pitches constituting the repetitive pattern are required to be the same or similar to each other.

  A group of pitches with the same pitch pattern is called the same pitch group. Among the elements such as pitch pattern shape, start point position, end point position, intermediate point position, number, size, length, width, color tone, brightness, A group of pitches when at least one element is invariant at all pitches is referred to as a similar pitch group. Therefore, the repetitive pattern is a pattern in which pitches 40 of the same pitch group or similar pitch groups are arranged in the tunnel length direction. Further, the pattern 50 is not only drawn by a continuous line such as a straight line, but may be drawn by using a discontinuous line such as a dotted line as illustrated in FIG. good.

It should be noted that the pattern does not necessarily have to be in the pitch section as long as the reference points for determining the pitch section are included in the pitch section. Specifically, in the “>” pattern, which will be described in detail below, if the left ends are reference points that determine the pitch division, the right center tip protrudes from the pitch division and is adjacent to the right side. You may protrude to the division of a pitch. Also, in a diagonal pattern such as “/”, when the left end of the next “/” pattern overlaps vertically below the upper right end, if the pitch reference point is the lower left end, the upper right end Although it protrudes to the partition, there is no problem even if it is such a pattern.
In the case of the same pitch group, any position of the pattern may be used as the reference point. On the other hand, in the similar pitch group, the position of the pattern serving as the reference point differs depending on the form of the pattern, so it cannot be specified unconditionally. However, when focusing on the common elements of the similar pitch group, the reference point is generally sensed. In many cases, an appropriate position is found as a position.

The pitch width decreasing repeating pattern 32 has the following features (1) and (2) among the repeating patterns 30.
The feature of (1) is that the starting point of the pitch width reduction repeating pattern 32 exists at any point in the range of 150 to 300 m from the change point of the speed limit toward the tunnel entrance side. That is, the driver traveling through the tunnel 10 of the present invention passes 150 to 300 m before the speed change point and looks at the starting point of the pitch width reduction repeating pattern 32. As a result, it is possible for the driver to become a potential notice of the change point of the speed limit at the most appropriate time. If the starting point is provided 300 m or more before the speed limit change point, the alerting effect as a notice effect is poor. On the other hand, if it is set near 150 m, the deceleration response time until the speed limit changing point is reached. too short.

(2) is characterized in that among the pitch group constituting the pitch width reduction repeating pattern 32, the entrance side pitch 42 closest to the tunnel entrance side, the exit side pitch 44 closest to the tunnel exit side in the pattern, When the other pitch 40 sandwiched between the inlet side pitch 42 and the outlet side pitch 44 is an intermediate position pitch,
The pitch width d1 of the inlet side pitch 42 and the pitch width d2 of the outlet side pitch 44 are lengths obtained by the following equations, respectively.
d1 (m) = 1000 × s1 × (t / 3600)
d2 (m) = 1000 × s2 × (t / 3600)
(However, any value selected in the range of t = 0.25 to 0.3 (seconds), s1 = speed limit to the change point (km / h), s2 = speed limit from the change point to the previous speed ( km / h))
Each pitch width d3 of the intermediate position pitch all satisfies the following inequality,
d1 ≦ d3 ≦ d2
Each pitch width d3 of the intermediate position pitch is shorter than or equal to the pitch width of the pitch adjacent to the tunnel entrance side.

  The s1 is a speed limit until the speed limit change point is reached, and the s2 is a speed limit ahead of the speed limit change point. Therefore, t means the pitch passage time (seconds) in which the vehicle travels from one end to the other end of the pitch 40 when traveling at the speed limit. In the present invention, t is set to any value in the range of 0.25 to 0.3 (seconds).

  The effect of the pitch width reduction repeating pattern 32 is as follows. First, when you are passing the entrance side pitch 42 looking sideways, you can get a comfortable feeling if you are traveling at the speed limit applied up to the speed change point, but keep the speed as it is. When the vehicle is traveling, a sense of danger or a feeling of overspeed will suddenly occur when the vehicle passes through the outlet side pitch 44 while looking sideways. However, if you drive to a speed limit after the speed limit change point, the feeling of danger and overspeed will decrease, and comfort will be restored again. it can.

  The selection of the range of t that brings about the above effect is determined by examining the result of the questionnaire response. The questionnaire was conducted as follows. First, the subject refers to a CG video of a tunnel with a sequence design with pitch passage times t of 0.18 seconds, 0.24 seconds, and 0.36 seconds, respectively. We investigated which design was felt about comfort. 624 valid responses were obtained.

  FIG. 2 is a graph obtained by approximating the questionnaire result with an exponential expression for each of the feeling of overspeed, danger, and comfort. From FIG. 2, the pitch passage time t at which danger and comfort intersect is 0.272 seconds, and the feeling of overspeed and the risk increase suddenly when the pitch passage time t is shorter than 0.25 seconds. I understood.

Therefore, in the pitch width decreasing repeating pattern 32, even if the pitch width of the inlet side pitch 42 and the pitch width of the outlet side pitch 44 are changed and the vehicle is traveling at the same speed, the feeling of overspeed is near By making the driver feel the danger, the present invention is a potential notice of the change point of the speed limit, and in order to sufficiently bring out such an effect, t is set to 0.25 to 0.3 (seconds). It is limited to the range.
If t is less than 0.25 seconds, even if you are traveling at the speed limit, you already feel a sense of overspeed and danger, so by further shortening the pitch width, you can increase the feeling of overspeed and danger. However, the increase in alerting power due to that is scarce. If it exceeds 0.3 seconds, even if the pitch width is shortened, the feeling of overspeed and the sense of danger will only rise somewhat, not a rapid increase, so the increase in alerting power is still poor.

  In the point where the range of t used in the present invention is determined through the above-described verification, the present invention is that the driver who is in contact with the constant interval pitch has a narrower interval than a certain point. Even if the speed of driving is constant, it is not just using the phenomenon of illusioning that the speed has increased.

  It is assumed that the pitch widths d3 of the intermediate position pitches all satisfy the relationship of d1 ≦ d3 ≦ d2, and each pitch width d3 is shorter than or equal to the pitch width of the pitch and the adjacent pitch on the tunnel entrance side. The reason for this is to smoothly change the sense of speed and danger at the outlet side pitch 44 from the comfort at the inlet side pitch 42. If the intermediate position pitches are randomly arranged regardless of the pitch width, the effects that can be achieved with the present invention are almost diminished.

  In the pitch width reduction repeating pattern 32 used in the present invention, the total number of pitches 40 constituting the pattern is preferably 26 or less, and more preferably 20 or less. When the total number of pitches is 26 or less, when traveling at a speed limit, the time to pass from the start point to the end point of the pitch width reduction repeating pattern 32 can be within 8 seconds if it is 26 or less, and within 6 seconds if it is 20 or less. Therefore, since the spontaneous deceleration effect can be exhibited before getting tired of the pitch width reduction repeating pattern 32, the potential alerting power is further enhanced, which is preferable. In addition, from the survey conducted simultaneously in the questionnaire survey, it has been obtained that if the subject continues with a similar pattern for more than 6 seconds, the subject is less likely to be interested in the pattern. On the other hand, if the total number of the pitches 40 constituting the pitch width reduction repeating pattern 32 is less than 10, it is not preferable because the pitch width changes too rapidly.

In the pitch width reduction repeating pattern 32 used in the present invention, a pattern 50 (referred to as a pattern A) included in an arbitrary pitch 40 selected from the intermediate position pitch and the outlet side pitch 44 constituting the pattern is selected. In comparison with the pattern 50 (referred to as pattern B) included in the pitch 40 adjacent to the arbitrary pitch 40 on the tunnel entrance side, the center position of the pattern A with respect to the straight line connecting the upper and lower end positions of the pattern A is the tunnel. It is preferable that the design protrudes to the same extent as the pattern B on the outlet side or protrudes more than the pattern B. Typically, the shape of the entrance-side pitch 42 is a simple vertically long rectangular pattern 50, but the vicinity of the center gradually protrudes toward the tunnel length direction, and the exit-side pitch 44 has a “>”-shaped pattern. The pattern design changes to 50.
In general, when comparing a simple vertically long rectangular pattern 50 with a “>” shaped pattern 50 such as the tip of an arrow protruding near the center in the tunnel length direction, the latter shape feels a greater sense of speed. Therefore, in addition to the change in the pitch width (2) above, the shape of the pattern 50 also changes, so that a feeling of greater overspeed is felt when passing through the outlet side pitch 44 directly. The effect of the device can be further increased.

(Additional patterns)
As long as the sequence design 20 used in the tunnel 10 of the present invention includes at least the pitch width reduction repeating pattern 32, the other portions of the tunnel side wall surface may not be subjected to the sequence design. The sequence design 20 which does not have may be given.

However, in order to demonstrate the present invention more effectively, the pitches 40 of the same pitch group or similar pitch groups having the same pitch width are arranged in the vicinity of the pitch width reduction repeating pattern 32 in the tunnel length direction. It is preferable that the sequence design 20 is provided with a repetitive pattern 30.
This is because when the pitches 40 having the same pitch width are arranged, a constant rhythm is generated, and the change in the pitch interval in the pitch width reduction repeating pattern 32 is transmitted more dramatically. In order to sufficiently exhibit such an effect, it is preferable to arrange the pitches 40 so that the variable elements of the pattern 50 gradually change when the repetitive pattern 30 of the similar pitch group is selected.

  In addition, when the pitch width of the repetitive pattern 30 is arranged closer to the entrance side than the pitch width decreasing repetitive pattern 32, the pitch d is constant at d1, while when it is arranged closer to the outlet side than the pitch width decreasing repetitive pattern 32, If the distance d2 is constant, the pitch 40 interval change in the pitch width reduction repeating pattern 32 is further emphasized. Further, the total number of pitches of each repetitive pattern 30 is preferably 26 or less for each pitch 40 in order to prevent the pattern from getting tired and reducing the alerting power as described above.

  When a plurality of such repetitive patterns 30 are arranged, it is preferable that adjacent repetitive patterns 30 be avoided from being repetitive patterns 30 each composed of a similar piece group in which the same elements change. For example, the color gradually changes from red to purple, and the other is adjacent to the repetitive pattern 30 composed of pieces of the same pattern 50, the color gradually changes from purple to blue, and the others are from the same pattern 50 pieces. If the repetitive pattern 30 continues, it is easy to get bored. In addition, the position of the piece of the blue pattern 50 is the end point and starting point of the repetitive pattern 30, or the midpoint of the repetitive pattern 30 composed of similar pieces of the pattern 50 whose color changes from red to purple. It is difficult to determine whether or not.

In order to maximize the effect, the following repeating pattern 30 is preferable at both ends adjacent to the pitch width decreasing repeating pattern 32. First, assuming that the repeated pattern 30 arranged adjacent to the pitch width decreasing repeated pattern 32 and the tunnel entrance side is the pattern A, the pattern A is the same pitch 40 as the entrance side pitch 42, and the total number of pitches is 26 or less. 40 is a pattern arranged in the tunnel length direction, and then the repeated pattern 30 arranged adjacent to the pitch width decreasing repeated pattern 32 and the tunnel exit side is a pattern B, the pattern B is the same as the exit side pitch 44. The pitch 40 is a pattern in which a total of 26 or less pitches 40 are arranged in the tunnel length direction.
That is, it is preferable that a maximum of 26 inlet-side pitches 42 are arranged on the inlet side of the pitch width reduction repeating pattern 32, while a maximum of 26 outlet-side pitches 44 are arranged on the outlet side. The reason why the total number of pitches 40 is 26 or less is to prevent the pattern from getting tired and the alerting power from being lowered, as described above.

(Concrete example)
3A to 3H show an example of a specific sequence design 20 on one wall surface of the tunnel 10 of the present invention. The left side of the drawing is the inlet side, and the right side of the drawing is the outlet side. The sequence design 20 continues in the order of FIG. 3A → FIG. 3B → FIG. 3C → FIG. 3D → FIG. 3E → FIG. 3F → FIG. 3G, and the right end of FIG. Each figure is shown separated by one pattern length.

The sequence design 20 shown in FIGS. 3A to 3G is designed in consideration of the case where the speed limit change point at which the speed limit is changed more slowly than before is at the exit wellhead point or in the vicinity thereof. The pitch width decreasing repeating pattern 32, which is the main feature of the present invention, is shown in the position of FIG. 3E. Note that the reference numerals of the drawings are attached only to FIG. 3E, which is the most characteristic pattern of the present invention, and FIG. 3F, which is a pattern adjacent to this on the tunnel exit side, and other figures are omitted. In addition, for the pitch 40 and the pattern 50, all the pitches and patterns are not labeled, and only the pitch 40 and the pattern 50 are represented by symbols. This is because it is clear that other patterns, pitches, and patterns should be given the same reference numerals.
3A to 3G are shown without any color due to the limitation of the drawings that can be attached, but from the viewpoint of not feeling a psychological pressure in the tunnel, the colors of green color ( Green, yellowish green, etc.) are preferable.

In FIG. 3A, the sequence design 20 is shown on the right quarter. However, the sequence design 20 of FIG. 3A does not yet have a repeating pattern.
The repetitive pattern 30 starts from FIG. 3B. The repetitive pattern 30 shown in FIG. 3B has a pitch width equal to d1 (pitch width of the pitch on the entrance side of the pitch width decreasing repetitive pattern) and is composed of similar pitch groups having the height of the pitch pattern 50 as a common element. On the tunnel entrance side, the pitch 40 having dark horizontally long lines is gradually shortened, and instead, the number of light short lines increases between the dark horizontally long lines. .
The repetitive pattern 30 in FIG. 3C is composed of similar pitch groups having the same pitch width as d1 and having the number of pitch patterns 50 as common elements. A state of change in which the longitudinal length of the pattern 50 gradually increases toward the tunnel exit side is shown.
The repetitive pattern 30 in FIG. 3D has a pitch width of d1 and is composed of the same pitch group having a vertically long line shape.
In the pitch width reduction repeating pattern 32 in FIG. 3E, the pitch width of the entrance side pitch 42 is d1, the pitch width gradually decreases at the intermediate position pitch, and the pitch width 50 becomes d2 at the exit side pitch 44. And similar pitch groups having the common elements such as the color of the pattern and the height of the pattern 50. Although the entrance side pitch 42 is a vertically long line shape, a change state is shown in which the pattern 50 gradually becomes a “>” shape from the intermediate position pitch to the exit side pitch 44.
Note that, in the vicinity of the outlet side pitch 44, the front end of the central portion of the pitch pattern 50 having a “>” shape included in one pitch 40 protrudes to the adjacent pitch 40 on the right side. Although not clear from FIG. 3E, it is assumed that the pitch width reduction repeating pattern 32 shown in FIG. 3E has the characteristics (1) and (2).
The repetitive pattern 30 in FIG. 3F has a pitch width of d2 and is composed of the same pitch group of a plurality of pitches 40 having a pitch pattern 50 of “>” shape. It should be noted that the tip of the central portion of the pitch pattern 50 having a “>” shape included in one pitch 40 protrudes to the adjacent pitch 40 adjacent to the right.
The repetitive pattern 30 in FIG. 3G has a pitch width of d2 and is composed of similar pitch groups having the number of lines and colors as common elements. It is shown that the pitch pattern 50 with the “>” shape gradually becomes a simple vertically long pitch pattern 50 as it goes toward the tunnel exit side. Note that, on the tunnel entrance side, the tip of the central portion of the pitch pattern 50 having a “>” shape included in one pitch 40 protrudes to the adjacent pitch 40 adjacent to the right.

  As described above, the tunnel 10 to which the sequence design 20 of the present invention is applied is intended to prevent accidents by utilizing a part of human psychological tendency. Since it is a proposal related to the structure of an article, it uses the laws of nature and has industrial applicability.

It is the schematic of the tunnel of this invention when it faces to the tunnel exit side from the tunnel exit pit vicinity. It is the graph which approximated with an exponential formula about each of overspeed feeling, danger, and comfort. It is an example of the sequence design used for this invention. It is an example of the sequence design following FIG. 3A. It is an example of the sequence design following FIG. 3B. It is an example of the sequence design following FIG. 3C. It is an example of the sequence design following FIG. 3D. It is an example of the sequence design following FIG. 3E. It is an example of the sequence design following FIG. 3F.

Explanation of symbols

10 Tunnel 20 Sequence Design 30 Repeat Pattern 32 Pitch Decrease Repeat Pattern 40 Pitch 42 Entrance Side Pitch 44 Exit Side Pitch 50 (Pitch) Pattern

Claims (7)

The speed limit is changed slower than before because there is a tunnel entrance side and tunnel exit side, and the speed limit is changed more than 100m ahead in the tunnel or beyond the tunnel exit side tunnel because it is restricted in one direction. In a tunnel with a change point of
A sequence design is applied to a part of at least one side wall surface of the tunnel,
The sequence design includes a pattern in which a plurality of pitches are arranged in the tunnel length direction,
The pattern is
(1) The starting point exists at any point in the range of 150 to 300 m from the change point of the speed limit toward the tunnel entrance side,
(2) Among the group of pitches constituting the pattern, the entrance side pitch closest to the tunnel entrance side, the exit side pitch closest to the tunnel exit side in the pattern, and the entrance side pitch and the exit side pitch When other pitches that are sandwiched are used as intermediate position pitches,
The pitch width d1 of the inlet side pitch and the pitch width d2 of the outlet side pitch are lengths obtained by the following equations, respectively.
d1 (m) = 1000 × s1 × (t / 3600)
d2 (m) = 1000 × s2 × (t / 3600)
(However, any value selected in the range of t = 0.25 to 0.3 (seconds), s1 = speed limit to the change point (km / h), s2 = speed limit from the change point to the previous speed ( km / h))
Each pitch width d3 of the intermediate position pitch all satisfies the following inequality,
d1 ≦ d3 ≦ d2
A tunnel having a sequence design in which each pitch width d3 of the intermediate position pitch is a pitch width decreasing repeating pattern that is shorter or equal to the pitch width of the pitch adjacent to the tunnel entrance side.   The tunnel according to claim 1, wherein the total number of the pitches constituting the pitch width decreasing repeating pattern is 26 or less.   The design of the pitch width reduction repeating pattern is such that one pattern included in an arbitrary pitch selected from the intermediate position pitch and the exit side pitch of the pitch width reduction repeating pattern is on the tunnel entrance side of the selected pitch. In comparison with other patterns included in adjacent pitches, the central position of the one pattern with respect to a straight line connecting the upper and lower end positions of the one pattern protrudes to the tunnel exit side to the same extent as the other pattern. A tunnel according to claim 1, wherein the tunnel is of a protruding or more protruding design.   The tunnel according to claim 1, wherein the sequence design is provided on both side walls of the tunnel.   The tunnel according to claim 1, wherein the height of the sequence design is 2.0 to 4.0 m.   The sequence design includes, in addition to the pitch width reduction repeating pattern, one or more types of repeating patterns in which the pitches of the same pitch group or similar pitch groups having the same pitch width are arranged in the tunnel length direction. The tunnel according to claim 1. The sequence design is in addition to the pitch width decreasing repeating pattern,
A sequence design including the repeating pattern A arranged adjacent to the pitch width decreasing repeating pattern and the tunnel entrance side, and the repeating pattern B arranged adjacent to the pitch width decreasing repeating pattern and the tunnel exit side,
The repetitive pattern A is a pattern having the same pitch as the entrance side pitch, and a total of 26 or less pitches arranged in the tunnel length direction,
2. The tunnel according to claim 1, wherein the repetitive pattern B is a pattern in which a total of 26 or less pitches are arranged in the tunnel length direction and have the same pitch as the exit side pitch.