c n u 17 sustainable transit networks
TRANSCRIPT
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What we’ll cover
• Types of transit networks and their attributes
• Transit networks and placemaking
• Interaction between roadway networks and transit networks
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What’s a transit network?
Transit Network: the spatial configuration
of the individual lines of a transit system
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What’s a sustainable transit network?
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What’s a sustainable transit network?
1. Enabling: people can travel without depending on private vehicles
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What’s a sustainable transit network?
1. Enabling: people can travel without depending on private vehicles
2. Efficient: consumes least amount of resources for what you get
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What’s a sustainable transit network?
1. Enabling: people can travel without depending on private vehicles
2. Efficient: consumes least amount of resources for what you get
3. Fast: allows for timely travel
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What’s a sustainable transit network?
1. Enabling: people can travel without depending on private vehicles
2. Efficient: consumes least amount of resources for what you get
3. Fast: allows for timely travel
4. Affordable: can be maintained in all economic climates
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Transit Network Typologies
Radial Grid Hub and SpokeAmorphous
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Transit Network Typologies
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Amorphous Networks
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Amorphous Networks
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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
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Radial Networks
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Radial Networks
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Radial Networks
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Radial Networks
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Radial Networks
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Radial Networks
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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
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Grid Networks
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Grid Networks
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Spacing: 0.5 mile or less
Grid Networks
¼ mile walk
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Frequency: 12 minutes or less
Grid Networks
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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
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Hub and Spoke Networks
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Hub and Spoke Networks
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Hub and Spoke Networks
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Hub and Spoke Networks
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5%5%
CBD
95%95%
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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
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Enabling
Efficient
Fast
Affordable
to center
elsewhere
Transit Network Typologies
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local bus
rapid transit
commuter rail
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Transit Networks and Placemaking
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Transit Networks and Placemaking
Radial Grid Hub and SpokeAmorphous
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Transit Networks and Placemaking
Radial Grid Hub and SpokeAmorphous
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bus line
rail line
Transit Networks and Placemaking
CBD
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Transit Networks and Placemaking
TOD?
4 localities accessed directly
CBD
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Transit Networks and Placemaking
TOD?
7 localities accessed directly
CBD
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Roadway vs. Transit Networks
Most forms of transit – but not all –are dependent on the roadway network
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Roadway vs. Transit Networks
Surface transit needs roadways to access potential riders
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Roadway vs. Transit Networks
Potential riders need streets and sidewalks to access transit
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Roadway vs. Transit Networks
Connectivity and Density of the roadway network are critical to transit
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Network Connectivity
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Network Connectivity
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Network Connectivity
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Network Connectivity
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Network Connectivity
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Network Connectivity
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Network Connectivity
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Network Density
1/4 mile1/4 mile
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Network Density
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Network Density
1/2 mile1/2 mile
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Conclusions
• Networks are unseen; understand the big picture before tinkering with the details
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Conclusions
• Networks are unseen; understand the big picture before tinkering with the details
• Sustainable transit networks must be enabling, efficient, fast, and affordable
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• To serve one principle activity node: - Radial transit network is best
Conclusions
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• To serve one principle activity node: - Radial transit network is best
• To serve many dispersed activity nodes:
Conclusions
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• 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
Conclusions
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• 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
Conclusions
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• Connectivity: connected streets permit transit to reach riders and riders to reach transit
Conclusions
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• 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
Conclusions
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• Intense activities should be located near a transit network’s points of confluence
Conclusions
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