Retro Report Road Marking

1. ACKNOWLEDGEMENT
We would like to thank the PW (R) D NH Division - III for giving us the opportunity for demonstrating
our Advanced Technology Instrument Retro reflectometer (LTL-2000S), Delta Make-Denmark for testing
Retro reflectivity of all types of Road Markings.
We also thank all the Engineers and Officials of PW (R) D NH Division - III for attending the
demonstration of the above said equipment at KM 0.000 TO KM 05.050 KM in the state of Bihar and
appreciating the utility of the Retro reflectometer for Road Markings.

2. Introduction
Measuring principle and standards. Retroreflection:
Delta’s LTL-2000S Retro Reflectometer is a device that measures the retro-reflection of the Road
Markings for both its Day time & Night time visibility. RL is a measure of retro reflected light for Night
visibility, the QD is a measure of diffuse illumination during daytime.
These Road markings are basically Thermoplastic Paint material that is sprayed with Glass Beads on
the paint surface to provide retro-reflection. The light focused from the Vehicle head lamps falls on
these Glass Beads which reflect the light back to its source that will make them glow to provide
visibility to the vehicledrivers.
LTL-2000S comply with the following standards:
EN 1436, ASTM E 1710, ASTM E 2177, ASTM E 2302, ASTM E 2832
Standards for pavement markings:
Document attached
Portable Retro reflectometer Measuring Principle:
Document attached
LTL-2000SRETROREFLECTOMETER
On site quality control of road markings & road surfaces in accordance with CEN/ASTM
specifications
The LTL-2000S retro reflectometer is a portable field instrument intended for measuring the
retroreflection and reflection properties of road markings. LTL-2000S measures the RL value
(coefficient of retroreflected luminance at night) and the Qd value (day light visibility). RL is a measure
of the retroreflected light from the road marking as seen by drivers of motorized vehicles in car
headlight illumination. The road is illuminated at an angle of 1.24The illumination for Qd is diffused.
The reflected light for both RL and Qd is measured at an angle of 2.29, which corresponds to an
observation distance of 30 meters. This is relevant for a motorist’s viewing situation under normal
conditions. Further information on measuring principles and standards canbe found on
www.roadsensors.com.

3. RL and Qd are important measurement factors for ON-SITE quality control of road markings.
LTL-2000S retro reflectometer features Portable Instrument Ergonomic Operation Height Fast
measurement (completed in about 1sec.for RL or Qd and 3sec.for RL+Qd) Build in thermal printer
Measuring on dry and wet surfaces Will measure flat, textured & profiled markings up to 5mm Fully
documented measurements with automatic data storage, user and series identification for labeling and
grouping measurements RSC (Road Sensor Control) PC software for data exchange. Log data can be
exported to applications such as Microsoft Excel or displayed on Google Earth Easy one-step calibration
procedure. The instrument operates with a reproducibility of +/-5% and a repeatability of +/- 2%.The
measurement results along with date and time stamp and the GPS data saves in .csv file in the
equipment memory which can be seen after downloading on to the PC.
Calibration Unit
The road marking is simulated by a piece of white ceramic calibration test piece (the reference)
mounted on an aluminum profile supplied along with the main device. Ceramics have very stable optical
properties because of the smooth surface.

4. Calibration:LTL-2000S instrument is originally calibrated at DELTA’s DANAK- accredited laboratory
and are traceable in accordance with standards issued by PTB (Physikalish-Technische Bundesanstalt,
Germany) and NIST (National Institute of Standards and Technology, USA). The recommended daily
calibration of the instruments is simple and easy to carry out
Delta’s Retro reflectometer LTL-2000S was IRC accredited.
Our Clients for LTL-2000S Retro Reflectometer, Road Construction Companies, Consultants,
Contractors in India, who have been using Delta make Retro reflectometers for more than adecade.
IRC Standards
In IRC-35-2015 standards mentioned the Retro-reflectivity results with types of design speed.
As per MORTH (Fifth Revision) the thermoplastic paint shall be applied in intermittent or continuous
lines of uniform thickness at least 2.5mm unless specified otherwise.
Design Speed Considered:65-100Kmph
The Green and Red color is indicating the blow and above the permissible value respectively as per
IRC:35-2015.

5. Night-time visibility
Night-time visibility under Wet Condition

6. Note:
Qd-Retro Reflectivity during Day Time, Rl-Retro Reflectivity during Night time when dry, Rw-Retro Reflectivity during Night time when wet.
Units:mcd/sq.m/lx
Retro-Reflectivity Results of Road Markings
The Retro-reflectivity of the Road markings was tested with Retro-reflectometer instrument LTL- 2000S, Make: Delta, Denmark.
Road Markings (WHITE and YELLOW)
Design Speed Considered:65-100Kmph
LHS
S.No. Chainage Color
L1 L2 L3
L1 (along the shoulder) L2 (center line next to L1) L3 (along the median)
Qd RL Rw Qd RL Rw Qd RL Rw
1 0+000 White 118.39 134.42 73.49 103.07 121.29 76.59 154.11 184.34 94.82
2 0+000 Yellow 165.49 156.01 69.65 166.50 179.6 85.64 118.38 140.29 76.83
3 1+000 White 159.70 142.52 60.58 162.12 147.2 50.82 145.36 175.33 58.94
4 2+000 White 166.13 143.7 74.42 123.79 133.1 57.94 131.35 165.21 60.62
5 3+000 White 104.85 170.12 86.46 175.43 179.26 89.31 160.73 190.81 64.3
6 4+000 White 119.79 165.16 90.28 147.93 138.99 72.65 125.44 184.18 61.93
7 5+000 White 159.39 143.06 88.48 120.40 157.15 74.31 161.65 158.78 84.3
8 6+000 White 108.57 137.25 88.62 153.39 188.56 79.15 120.60 134.18 59.34
9 7+000 White 138.46 161.4 59.24 171.01 123.32 56.17 105.65 195.4 68.54
10 7+950 White 100.30 144.62 78.88 137.06 192.08 74.98 142.45 167.7 98.63
11 8+400 White 153.69 142.81 75.29 173.67 160.54 85.98 103.21 163.25 74.23
12 9+000 White 151.30 135.02 99.44 166.95 124.29 93.67 165.59 168.28 58.57
13 On bridge White 150.93 163.62 80.91 157.57 194.01 68.54 171.25 172.35 95.15
14 On bridge White 119.86 197.93 99.85 136.22 152.53 91.36 110.25 132.06 56.34
15 On bridge White 124.83 177 93.96 128.61 144.88 71.12 179.65 175.6 60.36
16 On bridge White 179.41 153.01 86.54 110.70 160.93 81.65 107.24 176.15 70.69
RHS

7. Note:
Qd-Retro Reflectivity during Day Time, Rl-Retro Reflectivity during Night time when dry, Rw-Retro Reflectivity during Night time when wet.
Units:mcd/sq.m/lx
S.No. Chainage Color
L1 L2 L3
L1 (along the shoulder) L2 (center line next to L1) L3 (along the median)
Qd RL Rw Qd RL Rw Qd RL Rw
1 0+0075 White 131.83 125.97 58.64 148.55 135.79 93.62 106.61 166.88 81.06
2 1+000 White 100.31 141.92 55.94 147.21 167.49 95.78 159.02 180.91 91.14
3 2+000 White 142.98 154.36 96.19 142.96 122.26 84.6 158.73 180.66 91.89
4 3+000 White 179.94 197.88 83 137.89 122.34 66.35 134.05 197.47 62.22
5 4+000 White 119.97 143.63 70.9 112.79 160.31 94.18 149.08 160.87 57.08
6 5+000 White 162.82 138.89 70.38 142.78 121.32 61.37 126.36 197.26 79.09
7 5+300 White 134.70 147.16 89.11 118.43 180.29 87.45 122.93 146.78 86.03
8 0+680 White 171.33 152.38 93.58 103.63 196.71 90.77 129.72 174.32 88.97
9 1+600 Yellow 129.37 124.01 64.67 156.53 155.5 68.06 171.01 169.27 86.45
Remarks: As per IRC: 35 – 2015. All lane marking is good.

8. Retroreflectivity Units:
mcd/m2/lx = Milli Candela per Square Meter per Lux
Conditions
The above test results are referring to the Retro reflectivity of Road Markings tested at site.
This test report is demonstration of LTL-XL Retro reflectometer to Engineer’s at site.
Chaitanya Projects Consultancy
will not be responsible in any way if this demonstration test report is altered/reproduced.
Retro reflectometer Demonstration/Testing at CHAINAGE5.050KM OF NH-333B IN THE DISTRICT
OF BIHAR
END OF REPORT