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Objectives
• develop minimum performance levels for pavement markings so that they can be maintained to provide reliable machine vision detection for ADAS such as LDW and LKA
• provide data and recommendations that an AASHTO/SAE Working Group can use to quickly develop guidelines and criteria
Testing Conditions
• 4-inch edge lines and lane lines
– Daytime
• Dry, wet recovery
– Nighttime
• Dry, wet recovery
• With and without
continuous roadway
lighting
Data Visualization
1 NB White 2.50 3.00 2.00 2.17 2.00 2.42 2.00 2.20 2.00 2.50 2.33 2.67 2.30 2.40 2.29 2.86 2.29 3.00
1 SB White 2.17 2.33 1.83 2.17 0.67 0.83 2.00 3.00 0.00 0.00 3.00 3.00 3.00 3.00 3.00 3.00 3.00 3.00
1 NB Yellow 0.00 0.00 0.67 0.67 0.00 0.33 0.00 0.67 0.00 0.67 0.67 0.33 0.22 0.11 2.00 2.00
1 SB Yellow 2.00 2.00 2.00 2.17 1.33 2.00 1.33 2.00 1.33 2.00 1.00 1.00 1.00 1.00 2.00 2.00
2 NB White 2.67 3.00 3.00 3.00 2.39 2.61 2.20 2.40 2.38 2.63 2.33 2.67 2.90 3.00 2.86 3.00 3.00 3.00
2 SB White 2.75 2.75 2.33 2.50 1.50 1.33 1.50 1.33 1.50 1.33 3.00 3.00 3.00 3.00 3.00 3.00 3.00 3.00
2 NB Yellow 2.40 3.00 2.17 2.83 2.33 2.67 2.60 2.80 2.50 3.00 2.67 3.00 2.67 2.89 2.57 2.71 2.86 2.86
2 SB Yellow 2.40 2.60 2.33 2.33 2.00 2.43 2.00 3.00 2.00 2.00 3.00 3.00 2.67 3.00 3.00 3.00 3.00 3.00
3 NB White 2.83 3.00 2.50 3.00 2.47 2.76 2.40 2.60 2.50 2.50 3.00 3.00 3.00 3.00 3.00 3.00 3.00 3.00
3 SB White 2.67 2.67 2.17 2.33 1.14 1.86 2.00 3.00 0.00 2.00 3.00 3.00 3.00 3.00 3.00 3.00 3.00 3.00
3 NB Yellow 2.60 3.00 2.17 3.00 2.18 2.35 2.00 2.00 2.00 2.50 3.00 3.00 2.89 2.89 2.67 3.00 3.00 3.00
3 SB Yellow 2.00 2.60 2.00 2.33 2.29 2.57 2.00 3.00 2.20 2.80 3.00 3.00 3.00 3.00 3.00 3.00 3.00 3.00
4 NB White 2.67 3.00 2.33 2.67 2.40 2.60 2.00 2.20 2.50 2.50 3.00 3.00 2.90 3.00 3.00 3.00 2.80 3.00
4 SB White 2.17 2.50 2.00 2.17 1.00 1.00 2.00 2.00 0.00 0.00 3.00 3.00 3.00 3.00 3.00 3.00 3.00 3.00
4 NB Yellow 2.60 2.80 2.67 2.67 2.47 2.67 2.80 2.80 2.50 3.00 2.67 3.00 3.00 3.00 2.80 2.80 3.00 3.00
4 SB Yellow 2.40 2.40 2.17 2.17 2.25 2.13 2.00 2.00 2.20 2.00 2.67 3.00 2.67 3.00 2.00 2.50 3.00 3.00
5 NB White 2.75 3.00 2.67 2.83 2.50 2.50 2.33 2.33 2.33 2.33 3.00 3.00 3.00 3.00 3.00 3.00
5 SB White 2.75 2.75 2.33 2.50 1.50 1.33 1.50 1.33 1.50 1.33 3.00 3.00 3.00 3.00 3.00 3.00
5 NB Yellow 2.40 2.80 2.17 2.67 2.46 2.54 2.40 2.40 2.50 2.67 3.00 3.00 3.00 3.00 2.50 3.00 3.00 3.00
5 SB Yellow 2.20 2.20 2.00 2.00 2.11 2.44 2.00 2.00 2.00 2.40 3.00 3.00 3.00 3.00 2.50 3.00 3.00 3.00
6 NB White 2.50 3.00 2.17 2.83 2.40 2.70 2.25 2.25 2.50 3.00 3.00 3.00 2.90 3.00 3.00 3.00 2.50 3.00
6 SB White 2.67 2.83 2.83 3.00 1.56 1.56 2.00 3.00 2.20 2.20 2.00 3.00 3.00 2.90 3.00 3.00 3.00 3.00
6 NB Yellow 2.60 3.00 2.83 3.00 2.40 2.80 2.75 2.75 2.20 3.00 3.00 3.00 3.00 3.00 2.50 2.75 2.75 3.00
6 SB Yellow 2.40 2.60 2.00 2.33 2.11 2.22 3.00 2.00 2.00 2.00 2.00 3.00 3.00 3.00 3.00 3.00 3.00 3.00
7 NB White 2.50 3.00 2.17 2.83 2.40 2.70 2.25 2.25 2.50 3.00 3.00 3.00 2.90 3.00 3.00 3.00 2.50 3.00
7 SB White 2.00 2.33 2.00 2.00 0.89 0.78 2.00 2.00 1.50 1.00 3.00 3.00 2.70 2.90 2.50 3.00 3.00 3.00
7 NB Yellow 3.00 3.00 2.50 2.67 2.67 2.67 2.67 2.67 2.67 2.67 2.67 2.67 2.89 2.89 3.00 3.00
7 SB Yellow 2.00 2.00 2.00 2.17 2.00 2.00 2.00 2.00 2.00 2.00 2.00 2.67 2.00 2.56 2.50 3.00
Daytime Nighttime
General Observations
• Edge lines and lane lines have similar performance
• Roadway lighting has minimal impact on nighttime performance
• Day conditions are generally more difficult than night conditions, especially day wet (i.e., glare)
• Speed has minimal impact (up to 65 mph)
Preliminary Findings
• Daytime dry: – QD > 100 mcd
– Δ QD > 25 mcd (marking – roadway surface)
• Daytime wet: – Testing continues
• Nighttime dry:– 30-m retroreflectivity > 50 mcd
• Nighttime wet:– Testing continues
Current Testing
• More wet testing
• 4-inch vs 6-inch
– ATSSA sponsored add-on
• On-coming glare (dry/wet night)
• Structured markings
Schedule
• Draft NCHRP report – September
• AASHTO-SAE spec draft – December
• Phase II testing proposed – CY 2018
– Contrast markings
– Next generation vision systems
– Continuous wetting tests
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