Method for measuring parameters of roadway low-position lighting fixtures

1 . An installation method of roadway low-position lighting fixtures based on parameter measurement, comprising:

selecting a plurality of low-position lighting fixtures determined by

S 101 : providing a plurality of first sets of low-position lighting fixtures each set with a respective pair of preset color temperature and color rendering index, or a second set of low-position lighting fixtures configurable with multiple pairs of preset color temperature and color rendering index;

S 102 : for each set of the plurality of first sets of low-position lighting fixtures or each pair of preset color temperature and color rendering index in the second set of low-position lighting fixtures, performing a dynamic visual recognition test dynamically recognizing a target under different predetermined luminance levels at different predetermined operating speeds, including:

S 201 : building a light environment for dynamic visual recognition on a dynamic experimental road on which a first target is placed randomly;

S 202 : adjusting the low-position lighting fixtures to one of the predetermined luminance levels under the preset color temperature and color rendering index;

S 203 : installing a speed detection device on a test vehicle, and equipping putting on an eye-tracker on a tested driver after the tested driver and an experimental operator getting on the test vehicle;

S 204 : the tested driver driving the test vehicle at one of the predetermined operating speeds along the dynamic experimental road, wherein the eye-tracker records eye movement data of the tested driver to visually recognize the first target, and wherein the experimental operator, according to the visual recognition based on the recorded eye movement data indicating the tested driver's recognition of the first target, marks a first position of the test vehicle at a moment of recognition when the driver sees the first target and a second position of the test vehicle passing the first target, thereby obtaining to obtain a recognition distance between the first and second positions;

S 205 : adjusting to a further one of the luminance levels, and repeating S 204 until completion of the dynamic visual recognition test of the driver under the different predetermined luminance levels at the operating speed under the preset color temperature and color rendering index;

S 206 : adjusting to the next pair of the preset color temperature and the color rendering index in the second set or changing to the next set of the first sets, and repeating S 205 until completion of the dynamic visual recognition test of the driver at the operating speed in different lighting environments of the lighting fixtures;

S 207 : adjusting the test vehicle to the next operating speed, repeating S 204 to S 206 until completion of the dynamic visual recognition test of the driver under different predetermined luminance levels at the different predetermined operating speeds in the different lighting environments of the lighting fixtures, and changing to a next driver; and

S 208 : repeating S 203 to S 207 until all the tested drivers completing the dynamic visual recognition test to obtain dynamic visual recognition samples each sample comprising the recognition distances and the luminance levels of the lighting fixtures;

S 103 : fitting, based on the obtained samples, a relationship model between recognition distance and luminance for determining a luminance threshold that satisfies a safe sight distance requirement for the roadway; and

S 104 : based on the fitted relationship model, determining at least one set of said plurality of first sets of low-position lighting fixtures or determining at least one pair of preset color temperature and color rendering index for said second set of low-position lighting fixtures that meets the luminance threshold; and

installing the plurality of low-position lighting fixtures along both sides of a road, wherein the plurality of low-position lighting fixtures comprise the at least one determined first set of low-position lighting fixtures, or are configured with the at least one pair of determined color temperature and color rendering index.

2 . The installation method according to claim 1 , wherein the installing the plurality of low-position lighting fixtures along both sides of a road, comprises: installing double-beam barrier or three-beam barrier along both sides of the road; and

arranging the plurality of low-position lighting fixtures at intervals in a groove of the double-beam barrier or in an upper groove of the three-beam barrier in a road direction.

3 . The installation method according to claim 2 , wherein the installation height of the low-position lighting fixtures is in the range of 55 to 85 cm.

4 . The installation method according to claim 2 , wherein in a straight line section of the road, for the double-beam barrier, the installation height of the low-position lighting fixtures is 60 cm and for the three-beam barrier, the installation height of the low-position lighting fixtures is 80 cm.

5 . The installation method according to claim 1 , wherein the installing the plurality of low-position lighting fixtures along both sides of a road, comprises:

installing the plurality of low-position lighting fixtures to illuminate in a vehicle traveling direction in a manner that a light peak line of the lighting fixtures is substantially coincident with a center line of a driving lane of the road.

6 . The installation method according to claim 1 , wherein an horizontal projection angle of the low-position lighting fixtures on a left side of the road is in a range of 40° to 45°, and a vertical projection angle of the low-position lighting fixtures on the left side is in a range of 26°˜31°.

7 . The installation method according to claim 1 , wherein a horizontal projection angle of the low-position lighting fixtures on a right side of the road is in a range of is 26°˜31°, and a vertical projection angle of the low-position lighting fixtures on the right side is in a range of 27°˜32°.

8 . The installation method according to claim 1 , wherein the installing the plurality of low-position lighting fixtures along both sides of a road, comprises:

for a straight-line section of the road, installing the plurality of low-position lighting fixtures at a fixed installation height.

9 . The installation method according to claim 1 , wherein the installing the plurality of low-position lighting fixtures along both sides of a road, comprises:

for a slope section of the road, installing the plurality of low-position lighting fixtures with gradually changing installation heights.

10 . A road, comprising a plurality of low-position lighting fixtures installed by the steps of:

selecting a plurality of low-position lighting fixtures determined by:

S 101 : providing a plurality of first sets of low-position lighting fixtures each set with a respective pair of preset color temperature and color rendering index, or a second set of low-position lighting fixtures configurable with multiple pairs of preset color temperature and color rendering index;

S 102 : for each set of the plurality of first sets of low-position lighting fixtures or each pair of preset color temperature and color rendering index in the second set of low-position lighting fixtures, performing a dynamic visual recognition test dynamically recognizing a target under different predetermined luminance levels at different predetermined operating speeds, including:

S 201 : building a light environment for dynamic visual recognition on a dynamic experimental road on which a first target is placed randomly;

S 202 : adjusting the low-position lighting fixtures to one of the predetermined luminance levels under the preset color temperature and color rendering index;

S 203 : installing a speed detection device on a test vehicle, and equipping an eye-tracker on a tested driver after the tested driver and an experimental operator getting on the test vehicle;

S 204 : the tested driver driving the test vehicle at one of the predetermined operating speeds along the dynamic experimental road, wherein the eye-tracker records eye movement data of the tested driver to visually recognize the first target, and wherein the experimental operator, according to the visual recognition based on the recorded eye movement data indicating the tested driver's recognition of the first target, marks a first position of the test vehicle at a moment of recognition when the driver sees the first target and a second position of the test vehicle passing the first target, thereby obtaining to obtain a recognition distance between the first and second positions;

S 205 : adjusting to a further one of the luminance levels, and repeating S 204 until completion of the dynamic visual recognition test of the driver under the different predetermined luminance levels at the operating speed under the preset color temperature and color rendering index;

S 206 : adjusting to the next pair of the preset color temperature and the color rendering index in the second set or changing to the next set of the first sets, and repeating S 205 until completion of the dynamic visual recognition test of the driver at the operating speed in different lighting environments of the lighting fixtures;

S 207 : adjusting the test vehicle to the next operating speed, repeating S 204 to S 206 until completion of the dynamic experiment visual recognition test of the driver under different predetermined luminance levels at the different predetermined operating speeds in the different lighting environments of the lighting fixtures, and changing to a next driver; and

S 208 : repeating S 203 to S 207 until all the tested drivers completing the dynamic visual recognition test to obtain dynamic visual recognition samples each sample comprising the recognition distances and the luminance levels of the lighting fixtures;

S 103 : fitting, based on the obtained samples, a relationship model between recognition distance and luminance for determining a luminance threshold that satisfies a safe sight distance requirement for the roadway; and

S 104 : based on the fitted relationship model, determining at least one set of said plurality of first sets of low-position lighting fixtures or determining at least one pair of preset color temperature and color rendering index for said second set of low-position lighting fixtures that meets the luminance threshold; and

installing the plurality of low-position lighting fixtures along both sides of a road, wherein the plurality of low-position lighting fixtures comprise the at least one determined first set of low-position lighting fixtures, or are configured with the at least one pair of determined color temperature and color rendering index.

11 . The method according to claim 10 , comprising:

S 301 : building a light environment for static visual recognition on a static experimental road on which a second target is placed randomly;

S 302 : adjusting the light source to have the preset color temperature and color rendering index;

S 303 : with the luminance levels being adjusted, from low to high or from high to low, multiple drivers visually recognizing the second target at a first sight distance from the second target, and recording static visual recognition results of the drivers;

S 304 : under the same pair of color temperature and color rendering index, changing to a second sight distance, and repeating S 303 ;

S 305 : adjusting to the next pair of color temperature and color rendering index, and repeating S 303 and S 304 ; and

S 306 : repeating S 302 to S 305 to obtain a relationship curve of static calibration states under the different color temperatures and/or the color rendering indexes as well as the different luminance levels.

12 . The method according to claim 11 , wherein the step S 101 comprises: pre-verifying the preset color temperatures and color rendering indexes based on the relationship curve of the static calibration state.

13 . The method according to claim 10 , wherein the S 103 comprises: for the sight distances and the respective luminance levels of the samples obtained under the same pair of color temperature and color rendering index, fitting the recognition distances and the respective luminance levels of the samples using a Sigmoid function model.

14 . The method according to claim 10 , wherein the S 104 comprises: determining the at least one set of said plurality of first sets each having the pair of preset color temperature and color rendering index which meet driver's safe visual recognition requirements, or determining for said second set, the at least one pair of preset color temperature and color rendering index which meet driver's safe visual recognition requirements.

15 . The method according to claim 10 , wherein the S 104 comprises:

S 401 : selecting multiple first sets of low-position lighting fixtures having the pairs of preset color temperatures and color rendering indexes which meet driver's safe visual recognition requirements, or selecting for said second set, multiple pairs of the preset color temperatures and color rendering indexes of the low-position lighting fixtures which meet the driver's safe visual recognition requirements;

S 402 : determining energy consumption of the selected first sets of low-position lighting fixtures or energy consumption of the second set of low-position lighting fixtures with the selected pairs of preset color temperatures and color rendering indexes under a road-installed state;

S 403 : determining the at least one first set with minimum energy consumption or the at least one pair of preset color temperature and color rendering index for the said second set with minimum energy consumption.