Transit-oriented development concentrates housing, jobs and daily amenities in compact, walkable, mixed-use neighbourhoods around high-quality public transport - so that daily life can run on walking, cycling and transit rather than the private car. It is the planning idea behind half the metro announcements on Page 3 of this edition, and it is written directly into Vietnam's new Urban Development Law on Page 1.
The conventional TOD catchment is 400-800 metres from a station - a five-to-ten-minute walk - with density highest at the station and tapering outward. Researchers note the half-mile radius is more historical convention than analytically derived threshold, but it remains the de facto standard for rail TOD worldwide.
ITDP's TOD Standard distils practice into eight principles - walk, cycle, connect, transit, mix, densify, compact, shift - scoring station-area development on everything from block sizes to parking caps. The last principle, "shift," is the politically hardest: reclaiming road and parking space from the car to make the rest viable.
Sources: ITDP Eight Principles - TOD Standard 3.0 - Guerra et al., JTLU