An exposition of a road lighting model to facilitate simple estimation of road surface illuminance parameters for conventional system specifications and recommendations for retrofitting of luminaires

2022 ◽  
Author(s):  
Subarna Roy ◽  
Parthasarathi Satvaya ◽  
Sourin Bhattacharya ◽  
Sanjib Majumder ◽  
Sudipta Majumder ◽  
...  
Keyword(s):  
Road Surface ◽  
Conventional System ◽  
Road Lighting ◽  
Simple Estimation

A new procedure for determining the road surface reduced luminance coefficient table by on-site measurements

2018 ◽  
Vol 51 (1) ◽  
pp. 65-81 ◽  
Author(s):  
N Strbac-Hadzibegovic ◽  
S Strbac-Savic ◽  
M Kostic
Keyword(s):  
Road Surface ◽  
Surface Reflection ◽  
The Road ◽  
Road Lighting ◽  
Average Luminance ◽  
Road Surfaces ◽  
Q Values

Numerous measurements have shown that the standard R classes do not represent adequately many road surfaces used nowadays. Therefore, the construction of portable reflectometers intended for on-site measurements of road surface reflection properties has been given particular attention during the last decade. This paper presents a new procedure for the improvement of the accuracy of such a portable reflectometer. Optimally extrapolating the values of the 20 luminance coefficients (q), each measured by the portable reflectometer for a set of angles of observation (α = 5°–80°), the 20 q-values referring to α = 1° are calculated. This enables their comparison with the corresponding q elements from each of the 447 reduced q-tables derived from the available r-table database, obtained by using a precise laboratory reflectometer on a wide variety of road samples. Selecting the closest reduced q-table, the corresponding r-table and the actual average luminance coefficient can be determined. In order to validate the proposed procedure, which can also be applied to other similar portable reflectometers, measurements of the luminance and overall and longitudinal luminance uniformities were carried out on eleven road-lighting installations. They showed that the results obtained by this procedure deviate only slightly from those obtained using r-tables determined by the laboratory reflectometer.

Evaluation Index LPD of Highway Lighting’s Energy-Saving

2012 ◽  
Vol 178-181 ◽  
pp. 1628-1630
Author(s):  
Wei Li ◽  
Chuan Zheng Zhu ◽  
Yong Yang
Keyword(s):  
Energy Saving ◽  
Power Density ◽  
Traffic Safety ◽  
Calculation Method ◽  
Influence Factors ◽  
Road Surface ◽  
Evaluation Index ◽  
Lighting System ◽  
Road Lighting ◽  
Standard Value

LPD’s (lighting power density) definition, calculation method, standard value, influence factors and ways to reduce it are talked in this article. The aim is to take measures to reduce LPD properly. LPD should be less than standard value while guaranteeing traffic safety, average and uniformity road surface luminance. Then a road lighting system of energy-saving should be built as soon as possible.

Research on the Electrical Energy of Piezoelectric-Embedded Asphalt Mixture

2013 ◽  
Vol 303-306 ◽  
pp. 26-31 ◽  
Author(s):  
Ning Tang ◽  
Chang Jun Sun ◽  
Shao Xu Huang ◽  
Pan Pan ◽  
Shao Peng Wu
Keyword(s):  
Asphalt Concrete ◽  
Road Safety ◽  
Vibrational Energy ◽  
Piezoelectric Materials ◽  
Asphalt Mixture ◽  
Electrical Energy ◽  
Road Surface ◽  
The Road ◽  
Road Lighting ◽  
Road Performance

There is an important effect on road safety with no lighting facilities near the wild road. With the piezoelectric materials embedded in the asphalt concrete as the smart aggregates, the piezoelectric asphalt concrete transforms the vibrational energy of road surface into electrical energy, to supply the road lighting facilities or be stored up. In this study, the electrical energy of piezoelectric-embedded asphalt mixture by using UTM and wheel tester. The results show that PMnS-PZN-PZT ceramic doped with 0.45wt% Fe2O3 (4mm×8pieces) be embedded in the AC-10 asphalt concrete which can obtain well road performance and micropower electrical energy.

scholarly journals Design of Counter Beam Tunnel Lights for CIE 88 : 2004 Regulation in Threshold Zone

2020 ◽  
Vol 2020 ◽  
pp. 1-9
Author(s):  
Ming-Jui Chen ◽  
Hien-Thanh Le ◽  
Lanh-Thanh Le ◽  
Wei-Hsiung Tseng ◽  
Wei-Yang Lee ◽  
...  
Keyword(s):  
Surface Brightness ◽  
Maximum Level ◽  
Road Surface ◽  
Driving Safety ◽  
Minimum Level ◽  
Road Tunnel ◽  
Source File ◽  
Road Lighting ◽  
Dimensional Simulation ◽  
Beam Tunnel

To enhance driving safety, a counter beam light is proposed to meet CIE (International Commission on Illumination) specifications for tunnel lighting. The proposed new counter beam light (CBL) acts as a qualified counter beam light to help tunnel road lighting meet the CIE 88 : 2004 regulation standard in the threshold zone in both simulation and in practice. Through appropriate arrangements of the counter beam light and conventional fluorescent lights on the tunnel ceiling, we demonstrate that road tunnel lighting meeting CIE 88 : 2004 standards can be accomplished. Based on LiteStar four-dimensional simulation, the source file created through the measurement of the proposed CBL prototype achieved an average road surface brightness of 121 cd/m2, which is greater than the minimum regulation level of 105 cd/m2, a brightness uniformity of 0.88 (minimum regulation level of 0.4), longitudinal brightness uniformity of 0.98 (minimum regulation level of 0.6), a glare factor of 4.41% (maximum level of 15%), and a contrast revealing coefficient of 1.08, which is above the 0.6 minimum level in the threshold zone.

Veiling luminance and visual adaptation field in mesopic photometry

2016 ◽  
Vol 49 (6) ◽  
pp. 743-762 ◽  
Author(s):  
M Maksimainen ◽  
M Puolakka ◽  
E Tetri ◽  
L Halonen
Keyword(s):  
Visual Field ◽  
Road Surface ◽  
Visual Adaptation ◽  
High Luminance ◽  
The Road ◽  
Road Lighting ◽  
Average Luminance ◽  
Adaptation State ◽  
Adaptation Field

In mesopic photometry, adaptation luminance is needed to derive the mesopic luminances for the measurement field. The average luminance of the visual adaptation field is considered as the adaptation luminance. The visual adaptation field has yet to be defined in terms of the size, shape, or location within the visual field. A study in three road lighting situations was conducted, in order to determine the feasibility of using the road surface as the adaptation field compared to circular or elliptical adaptation fields. Currently, the road surface is used as the measurement field for calculating road lighting. Using the road surface as the adaptation field resulted in 76–113%, higher average luminance than obtained using circular or elliptical adaptation fields when the road was bordered by a park. High-luminance sources outside of the visual adaptation field cause veiling luminance. Veiling luminance increases the adaptation state, but not the luminance within the measurement field. The bias veiling luminance can cause on mesopic luminance calculations was estimated to be less than 2%. The estimated bias can be considered trivial in practical road lighting measurements.

Effects of Luminaire Angle and Illumination Topology on Illumination Parameters in Road Lighting

2020 ◽  
pp. 47-56
Author(s):  
Mehmet Sait Cengiz
Keyword(s):  
Road Surface ◽  
Simulation Program ◽  
Horizontal Line ◽  
The Road ◽  
Road Lighting

In this study, refers to two errors in road lighting. It explains the advantages of the staggered layout of luminaires and the problems associated with the use of luminaires located at an angle to the horizontal line of the road. The errors made by the simulation program were proved quantitatively and suggestions for their solution were presented. The loss of luminance of the road surface when illuminated by luminaires located at an angle to the horizontal has been quantitatively proved. In addition, it was found that with the appropriate choice of the layout of luminaires with road lighting, the step between the poles could be reduced by 9.3 %.

INFLUENCE OF ROAD SURFACES ON THE CALCULATION OF A TARGET VISIBILITY TAKING INTO ACCOUNT THE DIRECT AND INDIRECT LIGHTING

2021 ◽  
Author(s):  
L. Lebouc ◽  
V. Boucher ◽  
F. Greffier ◽  
S. Liandrat ◽  
A. Nicolaï ◽  
...  
Keyword(s):  
Road Surface ◽  
Street Lighting ◽  
Target Luminance ◽  
The Road ◽  
Road Lighting ◽  
Road Users ◽  
Road Surfaces ◽  
Indirect Lighting ◽  
On The Road ◽  
Target Visibility

Street lighting ensures visibility and legibility for road users. In this paper, performances of the lighting installation of four road sections with different type of road surface are simulated in accordance with guidelines and road lighting standards. Then, the calculation of the visibility level of a target according to the Adrian’s model is included. Next, the light reflections on the road surface are added to the calculation of the target luminance. For this, the area considered in front of the target as well as the number of elementary surfaces are fixed and a Q_0-scaling of the r-table obtained for α=45° is performed. We compare the results obtained for each section with and without considering the light reflections and conclude that there is negligible incidence of the nature of the road surface on the target luminance. However, an effect of the road surface on the visibility level of the target is observed.

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