Tod Design

Transit-Oriented Development (TOD) Design Skill

This skill provides a complete framework for designing transit-oriented developments based on the ITDP TOD Standard v3.0, global best practices from cities like Tokyo, Hong Kong, Copenhagen, Curitiba, and Singapore, and density-distance gradient principles derived from decades of empirical research. It covers the full workflow from transit mode classification through station area planning, density calibration, use mix programming, parking management, and first-last mile connectivity design.

1. TOD Typology Selector

Use the following matrix to determine the baseline design parameters for any TOD project. Start by identifying the transit mode, then adjust using the context modifiers below the table.

Primary Classification by Transit Mode

Context Modifiers

Apply these after selecting the primary transit mode to fine-tune parameters:

Walk Catchment Adjustments

The standard walk catchments above assume flat terrain and a connected street grid. Adjust as follows:

• Hilly terrain (>5% average slope): reduce catchment by 20%
• Poor street connectivity (cul-de-sac pattern): reduce catchment by 25%
• Barriers (highway, river without crossing, rail line): truncate catchment at barrier
• Excellent pedestrian environment (wide sidewalks, shade, weather protection): increase catchment by 15%
• Covered or air-conditioned connections (Hong Kong, Singapore model): increase catchment by 25%

2. ITDP TOD Standard -- 8 Principles

The Institute for Transportation and Development Policy (ITDP) TOD Standard v3.0 provides an internationally recognized framework for evaluating and designing transit-oriented developments. The standard scores developments on a 0-100 scale across 8 principles. Use these principles as both a design checklist and a scoring rubric.

Scoring Thresholds

Principle 1: WALK (0-15 points)

Goal: Create a safe, complete, and comfortable pedestrian environment that makes walking the most attractive mode for short trips.

Scoring Criteria:

• Pedestrian network is complete with no gaps or dead ends (0-3 pts)
• Block perimeters are less than 250m for at least 90% of blocks (0-3 pts)
• Pedestrian crossings are safe, frequent, and accessible at every intersection (0-3 pts)
• Sidewalks are wide (minimum 2.0m clear), well-maintained, and ADA/universal-access compliant (0-3 pts)
• Pedestrian environment is comfortable: shade, weather protection, lighting, active frontages (0-3 pts)

Design Implications:

• Maximum block size: 120m x 120m (perimeter 480m), ideal 80m x 80m (perimeter 320m)
• Mid-block pedestrian passages for blocks exceeding 150m in any dimension
• Continuous sidewalks on both sides of every street, minimum 2.0m clear width
• Pedestrian crossings at all intersections, maximum 80m spacing on arterials
• Ground-floor transparency: minimum 60% glazing on commercial frontages
• Street trees for shade at 8-10m spacing, continuous canopy coverage target 40%+
• Pedestrian-scale lighting (4-6m poles, 3000K warm white, minimum 10 lux)

Principle 2: CYCLE (0-5 points)

Goal: Provide safe, connected cycling infrastructure and end-of-trip facilities that make cycling viable for trips up to 5 km.

Scoring Criteria:

• Connected cycling network within the TOD area, linking to station (0-2 pts)
• Adequate bicycle parking at station and destinations (0-2 pts)
• Bike-share system with station within 300m of transit stop (0-1 pt)

Design Implications:

• Protected bike lanes (physically separated) on all collector and arterial streets
• Bicycle parking ratios: 1 space per 4 residents, 1 per 10 employees, 1 per 20 retail visitors
• Secure, covered long-term bicycle parking at transit station (minimum 50 spaces for metro)
• Short-term bicycle parking (inverted-U racks) at every building entrance and station exit
• Bike-share station within 300m of transit stop, minimum 15 docks
• End-of-trip facilities in commercial buildings: showers, lockers, maintenance stations

Principle 3: CONNECT (0-15 points)

Goal: Ensure a highly connected street and path network that provides direct, multiple routes between any two points.

Scoring Criteria:

• Intersection density is greater than 100 intersections per km2 (0-5 pts)
• Small blocks: at least 80% of blocks have perimeter less than 400m (0-4 pts)
• Direct routes: pedestrian route directness ratio <1.3 (actual distance / straight-line distance) (0-3 pts)
• Connectivity index: ratio of links to nodes in the street network >1.4 (0-3 pts)

Design Implications:

• Street grid or modified grid preferred over dendritic (cul-de-sac) patterns
• Intersection density target: 120-160 per km2 (equivalent to 80-90m block spacing)
• Eliminate dead-end streets; provide through-connections for pedestrians and cyclists
• Where superblocks exist, penetrate them with pedestrian/cycle passages
• Align major pedestrian routes directly toward station entrances
• Provide at least 3 distinct pedestrian routes from any point in the catchment to the station

Principle 4: TRANSIT (0-5 points)

Goal: Ensure high-quality, frequent transit service that is easily accessible from all parts of the development.

Scoring Criteria:

• Walk distance from any point in the development to a transit stop is less than 500m (0-2 pts)
• Peak headway is less than 10 minutes (0-2 pts)
• Transit stops have quality amenities: shelter, seating, real-time information, lighting (0-1 pt)

Design Implications:

• Locate development density within 500m network distance of station entrance
• Advocate for service frequency of 5-minute peak headway for metro, 7-minute for LRT/BRT
• Design transit stops with: weather protection (roof minimum 3m x 6m), seating (minimum 4 seats), real-time arrival display, lighting (minimum 50 lux under shelter), accessible boarding platform
• Integrate bus stops with main station for seamless transfers (maximum 200m walk between modes)
• Provide clear, intuitive wayfinding from development to transit (signage visible from 200m+)

Principle 5: MIX (0-15 points)

Goal: Create a diverse mix of complementary land uses that supports walkable daily life and reduces the need for car trips.

Scoring Criteria:

• Complementary uses present: residential + commercial + civic within 500m (0-5 pts)
• Housing type diversity: at least 3 housing types (studio, 1-bed, 2-bed, 3-bed, townhouse) (0-3 pts)
• Affordable housing: at least 20% of units affordable to households at 60% AMI (0-4 pts)
• Income diversity: range of unit sizes and price points serving multiple income brackets (0-3 pts)

Design Implications:

• Target use mix: 40-60% residential, 20-30% commercial/office, 10-15% retail/F&B, 5-10% civic/institutional
• Ground floors along main streets: 100% active uses (retail, restaurants, services, community)
• Upper floors: flexible for residential, office, or hotel depending on market
• Affordable housing distributed throughout the development, not concentrated in one building
• Community facilities within the TOD: daycare, health clinic, library branch, community room
• Avoid single-use zones; every block should contain at least 2 distinct use categories
• Live-work units and flexible ground-floor spaces to support small businesses

Principle 6: DENSIFY (0-15 points)

Goal: Achieve residential and employment densities that support high-frequency transit and create vibrant, walkable neighborhoods.

Scoring Criteria:

• Residential density exceeds 15,000 people per km2 (0-5 pts)
• Non-residential density: significant employment and visitor attraction (0-5 pts)
• Combined density supports transit ridership targets (0-5 pts)

Design Implications:

• Minimum residential density: 100 DU/ha (net) for metro TOD, 50 DU/ha for BRT
• Employment density target: 200+ jobs per hectare within 400m of station
• Density peaks at the station and graduates outward (see Section 3 below)
• Use FAR bonuses and height incentives to concentrate density near station
• Minimum ground-floor commercial density: 0.5 FAR within 200m of station
• Phase development to build highest-density parcels first (within 400m of station)

Principle 7: COMPACT (0-10 points)

Goal: Ensure development is contiguous with the existing urban fabric, avoiding leapfrog development and sprawl.

Scoring Criteria:

• Development is contiguous with existing urbanized area (0-4 pts)
• No significant gaps or vacant parcels between the development and existing fabric (0-3 pts)
• Development fills in underutilized land before expanding outward (0-3 pts)

Design Implications:

• Prioritize infill and brownfield sites over greenfield
• Stitch new development into existing street grid; extend existing streets into the site
• Match building setbacks and street walls to surrounding context at edges
• Fill gaps in the urban fabric: parking lots, vacant lots, single-story commercial in transit zone
• Development phasing should radiate outward from station, not leapfrog to distant parcels
• Minimum lot coverage: 60% within 200m of station, 40% within 400-800m

Principle 8: SHIFT (0-20 points)

Goal: Reduce automobile dependence through parking management, traffic calming, and car-free zones.

Scoring Criteria:

• Parking supply is limited: maximum 0.5 spaces per residential unit within 400m (0-5 pts)
• Off-street parking is not visible from the street (screened or underground) (0-3 pts)
• Traffic calming measures on all local streets within 400m of station (0-4 pts)
• Car-free or car-lite zone within 200m of station (0-4 pts)
• TDM (Transportation Demand Management) program in place (0-4 pts)

Design Implications:

• Maximum parking: 0.3-0.5 spaces per residential unit within 400m of station
• Parking maximum, not minimum: do not require parking, cap it
• All parking structures wrapped with active uses on street-facing facades
• No surface parking lots within 400m of station (exception: temporary during phasing)
• Car-free zone: station plaza and at least 2 adjacent blocks (minimum 200m radius)
• Traffic calming on all streets: 30 km/h maximum within 400m, 20 km/h within 200m
• Unbundle parking from housing units (sell/rent separately)
• Car-share spaces: 1 per 20 residential units (each car-share vehicle replaces 8-13 private cars)

3. Density-Distance Gradient

The fundamental organizing principle of TOD is the density gradient: highest intensity at the station, decreasing with distance. This gradient responds to land value economics, walkability thresholds, and transit ridership optimization.

Gradient Zones

Zone A: Station Core (0-200m from station entrance)

• FAR: 5.0 - 10.0 (metro), 3.0 - 5.0 (LRT/BRT)
• Height: 8 - 40+ stories (metro), 6 - 12 stories (LRT/BRT)
• Use: mixed-use dominant -- commercial ground floors (retail, F&B, services), office/hotel middle floors, residential upper floors
• Character: station plaza, civic space, highest pedestrian activity, car-free zone
• Ground floor: 100% active frontage, minimum 4.5m floor-to-floor height, 60%+ transparency
• Parking: zero on-site surface parking, underground only at maximum 0.3 spaces/unit
• Public realm: station plaza (minimum 0.25 ha), wide sidewalks (4.5m+), street trees, public art

Zone B: Urban Core (200-400m)

• FAR: 3.0 - 5.0 (metro), 2.0 - 3.5 (LRT/BRT)
• Height: 6 - 12 stories (metro), 4 - 8 stories (LRT/BRT)
• Use: mixed residential and commercial, live-work units, neighborhood retail corridors
• Character: urban neighborhood, active streets, mixed building types
• Ground floor: 70%+ active frontage on main streets, residential entries on side streets
• Parking: maximum 0.5 spaces/unit, structured or underground, wrapped with active uses
• Public realm: neighborhood park (minimum 0.5 ha), sidewalks 3.0m+, protected bike lanes

Zone C: Transition (400-600m)

• FAR: 1.5 - 3.0 (metro), 1.0 - 2.5 (LRT/BRT)
• Height: 4 - 6 stories (metro), 3 - 5 stories (LRT/BRT)
• Use: predominantly residential with neighborhood retail at key intersections
• Character: quieter residential streets, townhouses and mid-rise apartments, schools, community facilities
• Ground floor: residential entries with setback gardens or stoops, corner retail at intersections
• Parking: maximum 0.7 spaces/unit, on-street + small structured lots
• Public realm: tree-lined residential streets, pocket parks, playgrounds, community gardens

Zone D: Edge (600-800m)

• FAR: 0.8 - 1.5 (metro), 0.5 - 1.0 (LRT/BRT)
• Height: 3 - 4 stories (metro), 2 - 3 stories (LRT/BRT)
• Use: residential with limited neighborhood services
• Character: low-rise residential, townhouses, row houses, small apartment buildings
• Ground floor: residential with front gardens or courtyards
• Parking: maximum 1.0 space/unit, on-street + private garages
• Public realm: residential streets with traffic calming, green corridors connecting to station

Worked Example: Metro Station TOD Program Calculation

Assumptions: Metro station, urban context, 800m catchment, circular area

Total catchment area = pi x 800^2 = 2,010,619 m2 = 201 ha
Less roads and infrastructure (25%): 201 x 0.75 = 151 ha net developable
Less parks and open space (15%): 151 x 0.85 = 128 ha net buildable

Zone A (0-200m):   pi x 200^2 = 12.6 ha gross -> 8.0 ha net -> FAR 6.0 -> 480,000 m2 GFA
Zone B (200-400m): pi x (400^2 - 200^2) = 37.7 ha gross -> 24.0 ha net -> FAR 3.5 -> 840,000 m2 GFA
Zone C (400-600m): pi x (600^2 - 400^2) = 62.8 ha gross -> 40.0 ha net -> FAR 2.0 -> 800,000 m2 GFA
Zone D (600-800m): pi x (800^2 - 600^2) = 87.9 ha gross -> 56.0 ha net -> FAR 1.0 -> 560,000 m2 GFA

TOTAL GFA: 2,680,000 m2

Program split (typical metro TOD):
  Residential (55%):  1,474,000 m2 -> at 80 m2/unit = 18,425 units -> at 2.5 persons/unit = 46,000 people
  Office (20%):         536,000 m2 -> at 15 m2/employee = 35,700 jobs
  Retail (10%):         268,000 m2
  Civic/Institutional (10%): 268,000 m2
  Hotel (5%):           134,000 m2 -> at 35 m2/key = 3,800 keys

Residential density: 46,000 people / 201 ha = 22,900 people/km2 (exceeds ITDP 15,000 threshold)
Combined density:    46,000 residents + 35,700 workers = 81,700 / 201 ha = 40,600 people/km2

4. First-Last Mile Design

The quality of first-last mile connections determines whether people actually walk or cycle to the station. A station with poor last-mile connectivity will underperform its ridership potential by 30-50%.

Pedestrian Network Quality

• Continuous sidewalks: both sides of every street within the catchment, minimum 2.0m clear
• Direct routes: pedestrian desire lines should be honored with direct paths to station; route directness ratio less than 1.3
• Level of service: smooth, even surfaces; ADA-compliant curb ramps at every crossing; tactile paving at crossings and platform edges
• Shade and weather protection: continuous shade canopy (trees or structures) along primary pedestrian routes to station; covered walkways within 200m of station entrance in hot or wet climates
• Lighting: minimum 10 lux along pedestrian routes, 30 lux at crossings and station approaches, CPTED (Crime Prevention Through Environmental Design) principles
• Active frontages: ground-floor retail and services along main walking routes to create safe, interesting, surveilled streets