02 traffic impact assessment

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2nd slide for urban transport course
http://www.eng.ukm.my/riza/UrbanTransport/UrbanTransport.htm

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02 traffic impact assessment

  1. 1. Urban TransportTraffic Study – Traffic Impact Assessment Riza Atiq bin O.K. Rahmat
  2. 2. Traffic Impact Assessment (TIA)All development will generate traffic into current or future transport facilitiesAll big development will generate internal traffic
  3. 3. TIA will answer the question of:What will the effect of a development to the surrounding transport facilitiesWhat is the magnitude additional traffic due to the development to the existing trafficHow will the additional traffic effect the current trafficWhat is the proposal to alleviate or minimise the impact
  4. 4. TIA activities Developer Architect / town planner Local Authority Traffic Survey Instruction by the local authority to execute TIA Analyses: •Trip generation •Modal split Appointment of a •Trip distribution transport engineer •Trip assignment •Analyses of LOS (Level of service) •Problem evaluationDiscussion to determine the scope, •Proposal to alleviate or reduce the identified problemsstudy area and study methodology Review the original lay-out plan andCollate existing data and information propose any improvement to the client and land use Final Report
  5. 5. TIA ContentExisting SituationAnalysesImpact to the Road NetworkRoad SafetyInternal Lay-outParking SpacePublic TransportPedestrian, bicycle and disable facilities
  6. 6. TIA Content: 1.Existing SituationExisting government transport policies for the development areaStructure plan and local plan prepared by the Local AuthorityExisting traffic and public transport facilities
  7. 7. TIA Content: 1.Existing Situation (Cont….) 1200 1000 Traffic Volume (PCU/Hr 800 600 400 200 0 6-7 7-8 8-9 9-10 10-11 11-12 12-13 13-14 14-15 15-16 16-17 17-18 18-19 19-20 20-21 21-22 Masa Menuju P/Bandar Dari P/Bandar Existing traffic flows
  8. 8. TIA Content: 1.Existing Situation (Cont..)….) 658 345 542 5 287 527 423 621 598 597 621 451 758
  9. 9. TIA Content: Existing Situation (Cont ….) Road safety record Pedestrian facilities Identify all planned transport facilities in the vicinity of the development Identify all other developments in the vicinity of the development and quantify the combine impact to the external traffic Identify all existing public transport facilities and the impact of the development to the facilities Identify potential traffic problem in the development
  10. 10. TIA Content: 2. Analyses Trip Generation Land use Attraction per 100 sq.m Production per 100 sq.m floor area (morning) floor area (afternoon) Office 3.7 person / hr 4.05 person / hr Hospital 1.52 person / hr 1.32 person / hr Shopping Centre 0.45 person / hr 0.95 person / hr Primary school 5.5 person / hr 5.5 person / hr High School 4.5 person / hr 4.5 person / hrCollege / University 2.0 person / hr 1.8 person / hr
  11. 11. TIA Content: 2. Analyses (Cont ….) Trip Generation Land use Production per unit Attraction per unit (morning) (afternoon) Apartment 2.11 person / hr 1.79 person / hr Condominium 1.73 person / hr
  12. 12. TIA Content: 2. Analyses (Cont ….) Example: Trip GenerationMorningLand use Residential unit Production Morning rate productionFlat 845 2.51 2121Single story link house 725 2.21 1602Double story link house 934 2.52 2354Condominium 837 2.05 1716 Total 7793AfternoonLand use Residential unit Production Afternoon rate AttractionFlat 845 2.1 1775Single story link house 725 1.81 1312Double story link house 934 2.15 2008Condominium 837 1.73 1448 Total 6543
  13. 13. TIA Content: 2. Analyses (Cont ….) Trip Distribution  Gravity model PiAj Where Tij = KiKj α Tij = Trip from zone i to Tij zone j Pi = Production of zone i 1 Ki = Aj = Attraction of zone j Tij = Travel time or travel ∑j K j A j / Tijα cost between zone i and zone j α = Parameter to be 1 Kj = calibrated. In Klang Valley, α = 2.05 for ∑i K i Pi / Tijα morning and afternoon peaks.
  14. 14. TIA Content: 2. Analyses (Cont ….) αProduction Constrain Aj / T ij Tij = Pi Model: ∑ j Aj / T α ijAttraction Constrain α Pi / T ij Model: Tij = A j ∑ P /T i i α ij
  15. 15. TIA Content: 2. Example Project Site
  16. 16. TIA Content: 2. ExampleTrip GenerationLand use QTY Rates ProductionFlat 205 2.51 515Link house 431 2.21 953Semi-D 125 2.55 319Bungalow 52 2.65 138 Total 1924
  17. 17. TIA Content: 2. Example (Cont ….)Trip DistributionDestination Travel Time Estimated Aj / Distribution Trip (min) attraction Tij2.05 DistributionIpoh 35 92000 62.871 0.271 522Batu Gajah 30 16500 15.466 0.067 128Gopeng 10 17200 153.295 0.662 1273 ΣAj/ Tij2.05 231.632 1.000 1924Distribution = (Aj / Tij2.05 ) / (Σ Aj / Tij2.05)
  18. 18. TIA Content: 2. Example (Cont ….)Modal Split (Modal Choice)Influencing factors Car ownership Household Income Distance to the transport facilities Travel Time Travel Cost Car park availability
  19. 19. TIA Content: 2. Example (Cont ….) Peak Hour Modal Split in Kuala Lumpur Land use Bus % Car / van / jeep Motor cycle % % 1 Government Office 27.6 57.4 15.0 2 Company Office 48.0 45.6 6.4 3 Bank 49.9 45.0 5.1 4 Hotel 35.9 60.1 4.0 5 Shopping Centre 54.3 40.7 5.0 6 Bungalow house 12.1 84.0 3.9 7 Semi-D house 16.2 79.4 4.4 8 Link House 42.1 48.5 9.4 9 Condominium 13.7 85.1 1.2 10 Apartment 39.9 45.0 15.1 11 Flat 49.5 28.3 21.7(Source JKAL, DBKL Annual Report, 1991)
  20. 20. TIA Content: 2. Example (Cont ….)Average Passenger (including driver) in Kuala Lumpur Land Use Car / Van / M / Cycle Bus (big) Bus (Mini) Jeep1 Office 1.55 1.25 75 352 Hotel 1.55 1.25 40 253 Shopping 2.14 1.30 75 35 Centre4 Houses 2.05 1.38 75 35(Source: JKAL, DBKL Annual Report, 1991)
  21. 21. TIA Content: 2. Example (Cont ….)A local authority has approved a proposeddevelopment of a housing estate. It consistsof 1250 link houses, 155 semi-D houses, 78bungalow houses, 390 units condominiums,820 units apartments and 970 units of flats.Calculate both inbound and outbound trafficflows during morning peak hours.
  22. 22. TIA Content: 2. Example (Cont ….)Land use Unit Product Prod Modal Split Person trip Number of Vehicles ion rate ucio Bus car M/C Bus car M/C Bus car M/C nLink house 1250 2.21 2763 42.1 48.5 9.4 1163 134 260 16 654 188 % % % 0Semi-D 155 2.55 395 16.2 79.4 4.4 64 314 17 1 153 13 % % %Bungalow 78 2.65 207 12.1 84.0 3.9 25 174 8 1 85 6 % % %Condo 390 2.05 800 13.7 85.1 1.2 110 680 10 1 332 7 % % %Apartment 820 2.11 1730 39.9 45.0 15.1 690 779 261 9 380 189 % % %Flat 970 2.51 2435 49.5 28.3 21.7 1205 689 528 16 336 % % % total 44 1939 786
  23. 23. TIA Content: 2. Example (Cont ….) to Ipoh To PLUS H’way 981 pcu/hr 247 pcu/hr 759 pcu/hr Proposed Development Assumption: Traffic growth 4.1% 365 Base year: 2010 pcu/hr to Batu 603 pcu/hr Gajah 61 pcu/hr 1021 pcu/hr to Gopeng
  24. 24. TIA Content: 2. Example (Cont ….) To Ipoh2014Traffic generated bythe development To PLUS H’way 247 pcu/hr Proposed Development 790 pcu/hr 380 pcu/hr To Batu 603 pcu/hr Gajah 61 pcu/hr 1063 pcu/hr to Gopeng
  25. 25. TIA Content: 3. Impact to the RoadNetworkLevel-Of-Service (LOS) = Flow/Capacity (or V/C)v/c < 0.9 OK V/C > 1.0 (LOS = F) V/C < 0.3 (LOS = A)
  26. 26. TIA Content: 4. Road SafetySafe to the residencesSafe to the visitors
  27. 27. TIA Content: 5. Internal Lay-out
  28. 28. TIA Content: 6. Parking SpaceMalaysia:1 cps / 50sq.m floor areaor1.25 / residential unit
  29. 29. TIA Content: 7. Public Transport
  30. 30. TIA Content: 8. Pedestrian, bicycle and disable facilities
  31. 31. Terimakasih Thank you

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