Evaluation of Double Drop Beads Pavement Edge Lines - University ...

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Table D-1. Prediction of Dry Retroreflectivity Values for Double Drop BeadsADT/LaneAge of aMarkingCTP/LaneRetroreflectivity(Exponential model)ADT/LaneAge of aMarkingCTP/LaneRetroreflectivity(Exponential model)2,500 0 0 520 7,500 0 0 5202,500 6 0.45 504 7,500 6 1.35 4722,500 12 0.9 488 7,500 12 2.7 4292,500 18 1.35 472 7,500 18 4.05 3902,500 24 1.8 458 7,500 24 5.4 3542,500 30 2.25 443 7,500 30 6.75 3222,500 36 2.7 429 7,500 36 8.1 2932,500 42 3.15 416 7,500 42 9.45 2662,500 48 3.6 403 7,500 48 10.8 2412,500 54 4.05 390 7,500 54 12.15 2192,500 60 4.5 378 7,500 60 13.5 1995,000 0 0 520 10,000 0 0 5205,000 6 0.9 488 10,000 6 1.8 4585,000 12 1.8 458 10,000 12 3.6 4035,000 18 2.7 429 10,000 18 5.4 3545,000 24 3.6 403 10,000 24 7.2 3125,000 30 4.5 378 10,000 30 9 2745,000 36 5.4 354 10,000 36 10.8 2415,000 42 6.3 332 10,000 42 12.6 2135,000 48 7.2 312 10,000 48 14.4 1875,000 54 8.1 293 10,000 54 16.2 1655,000 60 9 274 10,000 60 18 145Note: Age of a marking is in months. Retroreflectivity is in mcd/m 2 /lux.52
Retroreflectivity550500450400350300250200150100500ADT/Lane=2,500ADT/Lane=5,000ADT/Lane=7,500ADT/Lane=10,0000 10 20 30 40 50 60 70Age in monthsFigure D-1. Variation of dry retroreflectivity of Double Drop Beads with time.53
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Evaluation of Double DropBeads Pave
Page 5 and 6:
Test Three ........................
Page 7 and 8:
List of FiguresNumberPage1-1 Flat t
Page 9 and 10: 1.0 IntroductionThis study was cond
Page 11 and 12: Figure 1-1. Flat thermoplastic mark
Page 13 and 14: 2.0 Review of the LiteratureAn exte
Page 15 and 16: The Turner-Fairbank study updated t
Page 17 and 18: Bead StudiesAlabama and other state
Page 19 and 20: NCHRP 2006 StudyThe National Cooper
Page 21 and 22: For the FTM and PPM sites, test sec
Page 23 and 24: Figure 3-3. Illustration of 30-mete
Page 25 and 26: A limited test was performed to det
Page 27 and 28: As documented by HITEC (2001), the
Page 29 and 30: DDB retroreflectivity data three ti
Page 31 and 32: Cumulative traffic passages (CTP),
Page 33 and 34: Retroreflectivity (dry)The research
Page 35 and 36: Retroreflectaivity2502001501005001
Page 37 and 38: RetroreflectivityFor the dry curves
Page 39 and 40: 5.0 Service Life EstimationThis sec
Page 41 and 42: The 95% confidence intervals are re
Page 43 and 44: The values for estimated service li
Page 45 and 46: Table 6-1. Installation Costs of Ed
Page 47 and 48: 7.0 Conclusions and Recommendations
Page 49 and 50: ADTperlaneFTM95%Avg. C.I.Table 7-1.
Page 51 and 52: 8.0 ReferencesAlabama Department of
Page 53 and 54: Appendix A: AbbreviationsADTALDOTAS
Page 55 and 56: Dry RetroreflectivityDry Retrorefle
Page 57 and 58: Appendix C: Regression Analyses of
Page 59: Appendix D: Prediction of Retrorefl
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