C N U 17 Sustainable Transit Networks

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C N U 17 Sustainable Transit Networks

  1. 1. What we’ll cover • Types of transit networks and their attributes • Transit networks and placemaking • Interaction between roadway networks and transit networks
  2. 2. What’s a transit network? Transit Network: the spatial configuration of the individual lines of a transit system
  3. 3. What’s a sustainable transit network?
  4. 4. What’s a sustainable transit network? • Enabling: people can travel without depending on private vehicles
  5. 5. What’s a sustainable transit network? • Enabling: people can travel without depending on private vehicles • Efficient: consumes least amount of resources for what you get
  6. 6. What’s a sustainable transit network? • Enabling: people can travel without depending on private vehicles • Efficient: consumes least amount of resources for what you get • Fast: allows for timely travel
  7. 7. What’s a sustainable transit network? • Enabling: people can travel without depending on private vehicles • Efficient: consumes least amount of resources for what you get • Fast: allows for timely travel • Affordable: can be maintained in all economic climates
  8. 8. Transit Network Typologies Amorphous Radial Grid Hub and Spoke
  9. 9. Transit Network Typologies
  10. 10. Amorphous Networks
  11. 11. Amorphous Networks
  12. 12. Amorphous Networks • Confusing • Difficult to coordinate transfers • Not a network that you’d ordinarily design • May be all that can be done on older street patterns
  13. 13. Radial Networks
  14. 14. Radial Networks
  15. 15. Radial Networks
  16. 16. Radial Networks
  17. 17. Radial Networks
  18. 18. Radial Networks
  19. 19. Radial Networks • Ideal for serving one central activity center • Inflexible to changes in activity locations • Access any point on network with a single transfer • Can require out-of-direction travel • Poor continuity on grid street systems
  20. 20. Grid Networks
  21. 21. Grid Networks
  22. 22. Grid Networks ¼ mile walk Spacing: 0.5 mile or less
  23. 23. Grid Networks Frequency: 12 minutes or less
  24. 24. Grid Networks • Ideal for area wide coverage • Needs high density to justify frequent service • Best suited to grid street networks • Greater likelihood of transfers • Not convenient in low-density areas
  25. 25. Hub and Spoke Networks
  26. 26. Hub and Spoke Networks
  27. 27. Hub and Spoke Networks
  28. 28. Hub and Spoke Networks
  29. 29. 95% 5% CBD
  30. 30. Hub and Spoke Networks • Ideal for serving many activity centers • Less frequent service can still be attractive • Relatively economical to operate • Timed transfers are essential • Transfer facilities should be of high quality
  31. 31. Transit Network Typologies Enabling Efficient to center Fast elsewhere Affordable
  32. 32. local bus rapid transit commuter rail
  33. 33. Transit Networks and Placemaking
  34. 34. Transit Networks and Placemaking Amorphous Radial Grid Hub and Spoke
  35. 35. Transit Networks and Placemaking Amorphous Radial Grid Hub and Spoke
  36. 36. Transit Networks and Placemaking bus line rail line CBD
  37. 37. Transit Networks and Placemaking 4 localities accessed directly TOD? CBD
  38. 38. Transit Networks and Placemaking 7 localities accessed directly TOD? CBD
  39. 39. Roadway vs. Transit Networks Most forms of transit – but not all –are dependent on the roadway network
  40. 40. Roadway vs. Transit Networks Surface transit needs roadways to access potential riders
  41. 41. Roadway vs. Transit Networks Potential riders need streets and sidewalks to access transit
  42. 42. Roadway vs. Transit Networks Connectivity and Density of the roadway network are critical to transit
  43. 43. Network Connectivity
  44. 44. Network Connectivity
  45. 45. Network Connectivity
  46. 46. Network Connectivity
  47. 47. Network Connectivity
  48. 48. Network Connectivity
  49. 49. Network Connectivity
  50. 50. Network Density 1/4 mile
  51. 51. Network Density
  52. 52. Network Density 1/2 mile
  53. 53. Conclusions • Networks are unseen; understand the big picture before tinkering with the details
  54. 54. Conclusions • Networks are unseen; understand the big picture before tinkering with the details • Sustainable transit networks must be enabling, efficient, fast, and affordable
  55. 55. Conclusions • To serve one principle activity node: - Radial transit network is best
  56. 56. Conclusions • To serve one principle activity node: - Radial transit network is best • To serve many dispersed activity nodes:
  57. 57. Conclusions • To serve one principle activity node: - Radial transit network is best • To serve many dispersed activity nodes: – Grid: frequent transit service in dense areas with grid street system
  58. 58. Conclusions • To serve one principle activity node: - Radial transit network is best • To serve many dispersed activity nodes: – Grid: frequent transit service in dense areas with grid street system – Hub-and-Spoke: for most other situations
  59. 59. Conclusions • Connectivity: connected streets permit transit to reach riders and riders to reach transit
  60. 60. Conclusions • Connectivity: connected streets permit transit to reach riders and riders to reach transit • Density: streets suitable for transit service should be spaced every half mile to ensure an easy walk to transit
  61. 61. Conclusions • Intense activities should be located near a transit network’s points of confluence

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