Table 3

Base case and sensitivity analysis results

ConceptsBase caseSensitivity analyses
179 people who avoided injury902 people who avoided injuryOne death also avoidedMaximum VSLAll implementation costs accrued in first yearNo time lost due to speed reduction
WTP slight injuries8 548 744.053 018 129.6615 208 697.708 548 744.0511 081 705258 548 744.058 548 744.05
WTP moderate injuries10 975 783.503 864 712.5019 524 527.5510 975 783.5014 227 867.5010 975 783.5010 975 783.50
WTP severe injuries982 339.65392 935.861 768 211.37982 339.651 273 403.25982 339.65982 339.65
WTP death2 810 700.00
Total benefits20506867.207275778.0236501436.6223317567.2026582976.0020506867.2020506867.20
Implementation384 039.41384 039.41384 039.41384 039.41384 039.411 637 966.491 637 966.49
Maintenance253 536.10253 536.10253 536.10253 536.10253 536.10253 536.10253 536.10
Police327 708.22327 708.22327 708.22327 708.22327 708.22327 708.22327 708.22
Processing629 998.98629 998.98629 998.98629 998.98629 998.98629 998.98629 998.98
Time lost due to speed reduction12 880 620.9512 880 620.9512 880 620.9512 880 620.9512 880 620.9512 880 620.95
Total costs14 475 903.6614 475 903.6614 475 903.6614 475903.6614 475 903.6615 729 830.741 595 282.71
Ambulance106 470.0037 590.00189 420.00106 470.00106 470.00106 470.00106 470.00
Emergency57 402.5420 266.38102 124.4457 402.5457 402.5457 402.5457 402.54
Hospitalisation109 537.6038 693.80194 891.58109 537.60109 537.60109 537.60109 537.60
Total medical savings273 410.1496 550.18486 436.02273 410.14273 410.14273 410.14273 410.14
Property damage436 800.00436 800.00436 800.00436 800.00436 800.00436 800.00436 800.00
Non-institutionalised82 018.7228 956.02145 918.0482 018.7282 018.7282 018.7282 018.72
Hospital stays39 573.8113 979.0770 420.5539 573.8139 573.8139 573.8239 573.82
Total productivity losses avoided121 592.5342 935.09216 338.59121 592.53121 592.53121 592.53121 592.53
Total savings831 802.67576 285.271 139 574.61831 802.67831 802.67831 802.67831 802.67
Net benefit6 862 766.21−6 623 840.3723 165 107.579 673 466.2112 938 875.015 608 839.1319 743 387.16
Cost/person who avoided injury28 552.0880 870.9716 048.67
  • VSL, value of statistical life; WTP, willingness to pay.