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South Dublin County Council Newlands Cross Upgrade Traffic Modelling: Working Paper No. 2 As stated in section 2.5 of the report, the conditions to achieve successful validation according to the UK’s DETR DMRB are: 1 For flows greater than 700 pcu/h the percentage of modelled flow must be within ±15% of the count; or if flows are lower than 700 pcu/h the difference should be within ±100 pcu/h; and 2 For all flows, the GEH statistic must be below 5. The GEH statistic is a form of Chi-squared statistic that incorporates both relative and absolute errors. It is calculated as follows: GEH = ( (M – C) 2 / ((M + C)*0.5)) 0.5 Where M and C are the modelled and surveyed flows respectively. Tables A.1 and A.2 below present the traffic flow validation results for the Newlands Cross Local Area Model. Information provided includes surveyed and modelled flows, absolute and relative differences and GEH value for each site along the two adopted screen lines. Table A.1: Traffic Flow Validation Results (East – West Screen Line) Link description A Node B Node Counts Model \\DUBNTS06\DUBLIN_JOBS\D4500-D4599\D4556\4) DESIGN\11\EIS\EIS CHAPTERS\CHAPTER 5 TRAFFIC AND TRANSPORT\APPENDIXA5.2 MODEL VALIDATION REPORT_ISSUE1_TEMP REV1.DOC Absolute Difference % Difference GEH East-West Screenline - Inbound (northbound) Walkinstown Ave (Nass Rd to Long Mile Rd) 2867 2845 940 796 -144 -15% 4.9 Long Mile Rd (Nass Rd to Walkinstown Ave) 4271 5507 1321 1190 -131 -10% 3.7 Turnpike Rd (Nass Rd to Robinhood Rd) 7000 4213 507 505 -2 0% 0.1 M50 (south of N7 Interchange) 4291 4222 4420 4565 145 3% 2.2 R113 Belgrade Road (south of Newlands Cross) 4242 4233 1047 938 -109 -10% 3.4 N82 (Bianconi Ave to Orchard Ave) 4209 4254 817 819 2 0% 0.1 Garter Lane (N7 to Bianconi Ave) 4118 4259 86 49 -37 -43% 4.6 Total 9138 8861 -276 -3% 2.9 East-West Screenline - Outbound (southbound) Walkinstown Ave (Nass Rd to Long Mile Rd) 2845 2867 1184 1244 60 5% 1.7 Long Mile Rd (Nass Rd to Walkinstown Ave) 5507 4271 1314 1476 162 12% 4.3 Turnpike Rd (Nass Rd to Robinhood Rd) 4213 7000 149 243 94 63% 6.7 M50 (south of N7 Interchange) 4222 4291 3807 3943 136 4% 2.2 R113 Belgrade Road (south of Newlands Cross) 4233 4242 1312 1333 21 2% 0.6 N82 (Bianconi Ave to Orchard Ave) 4254 4209 1191 1232 41 3% 1.2 Garter Lane (N7 to Bianconi Ave) 4259 4118 60 134 74 123% 7.5 Total 9017 9604 587 7% 6.1 Page A1 Arup Consulting Engineers 24 March 2006
South Dublin County Council Newlands Cross Upgrade Traffic Modelling: Working Paper No. 2 Table A.2: Traffic Flow Validation Results (North – South Screen Line) Link description A Node B Node Counts Model \\DUBNTS06\DUBLIN_JOBS\D4500-D4599\D4556\4) DESIGN\11\EIS\EIS CHAPTERS\CHAPTER 5 TRAFFIC AND TRANSPORT\APPENDIXA5.2 MODEL VALIDATION REPORT_ISSUE1_TEMP REV1.DOC Absolute Difference % Difference GEH North-South Screenline Inbound (westbound) N4 (between Fonthill Rd and M50) 4330 4331 2529 2396 -133 -5% 2.7 Coldcut Rd (between Liffy Valley Ent and M50 4382 4383 353 377 24 7% 1.3 Cloverhill Rd (west of M50) 2835 7001 328 263 -65 -20% 3.8 R134 Nangor Rd (between Woodford Walk and M50) 4442 4443 622 635 13 2% 0.5 Monastery Rd (between Woodford Hill and Knockmeenagh Lane) 4232 4463 465 411 -54 -12% 2.6 N7 (between R113 and Luas Access) 4232 4233 2265 2158 -107 -5% 2.3 Ballymount Rd (west of M50) 4294 4111 630 709 79 13% 3.1 Greenhills Rd (west of M50) 4275 4123 1001 1031 30 3% 0.9 N81 (west of Tallaght Interchange) 4173 4181 2741 2410 -332 -12% 6.5 Total 10934 10389 -545 -5% 5.3 North-South Screenline Outbound (eastbound) N4 (between Fonthill Rd and M50) 4331 4330 3383 3378 -5 0% 0.1 Coldcut Rd (between Liffy Valley Ent and M50 4383 4382 1285 1188 -97 -8% 2.8 Cloverhill Rd (west of M50) 7001 2835 633 682 49 8% 1.9 R134 Nangor Rd (between Woodford Walk and M50) 4443 4442 1191 1295 104 9% 2.9 Monastery Rd (between Woodford Hill and Knockmeenagh Lane) 4463 4231 716 602 -114 -16% 4.5 N7 (between R113 and Luas Access) 4233 4232 3021 2715 -306 -10% 5.7 Ballymount Rd (west of M50) 4111 4294 992 979 -13 -1% 0.4 Greenhills Rd (west of M50) 4123 4275 1237 1107 -130 -10% 3.8 N81 (west of Tallaght Interchange) 4181 4173 2154 2170 16 1% 0.4 Total 14611 14114 -497 -3% 4.1 The results above show about 90% of links complying with conditions 1 and 2 set up above. This is in excess of 85% and therefore the model is considered to be successfully validated. Page A2 Arup Consulting Engineers 24 March 2006
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Kildare County Council South Dublin
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South Dublin County Council N7 Newl
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Page 269 and 270: South Dublin County Council N7 Newl
Page 288: PLATES
Page 292: APPENDIX A5 - TRAFFIC AND TRANSPORT
Page 295 and 296: South Dublin County Council Newland
Page 310 and 311: 0 kilometres 2 Scale N.T.S Ordnance
Page 322: APPENDIX A8 - NOISE AND VIBRATION
Page 326: APPENDIX A9 - AIR QUALITY
Page 334: APPENDIX A11 - ECOLOGY
Page 340: APPENDIX A12 - ARCHAEOLOGY, ARCHITE
Page 364: South Dublin County Council N7 Newl
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