Thrissur in context: Street-network sprawl trends

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Thrissur plotted against Kerala and India. The SNDi of new construction in Thrissur rose steadily, compared to Kerala which was at its lowest in 1976-1990 and India which followed a zig-zag trend with an overall increase. Most recently, Thrissur's incremental SNDi rose from 5.37 to 6.39 between 1991-2005 and 2006-2020. In terms of the aggregate network, Thrissur ranked 25th out of 48 cities in Kerala and 1465th out of 1868 in India as of 2020.

Rankings go from most connected to most disconnected — rank 1 is the most connected.

What about similarly populated cities?

• Yichang, China
• Dehradun, India
• Copenhagen, Denmark
• Yerevan, Armenia
• Weifang, China
• Nouakchott, Mauritania

In new street additions, Thrissur and Yerevan both built increasingly disconnected streets over time, while Yichang built increasingly disconnected streets from 1975 through 1976-1990, then improved. For the full street network, though, all three cities follow the same trend. Thrissur and Yichang have been growing further apart in their street-network character since 1975.