Hajja 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 Hajja plotted against Hajjah and Yemen. The SNDi of new construction in Hajja peaked in 1991-2005, compared to Hajjah which followed a zig-zag trend with an overall decrease and Yemen which followed a zig-zag trend with an overall increase. Most recently, Hajja's incremental SNDi fell from 10.25 to 6.99 between 1991-2005 and 2006-2020. In terms of the aggregate network, Hajja ranked 3rd out of 5 cities in Hajjah and 49th out of 58 in Yemen as of 2020.

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

What about similarly populated cities?

• Qaryat Salah al Din, Egypt
• Bahma, Egypt
• Rubio, Venezuela
• Chandipur, India
• Gbarnga, Liberia
• Ariquemes, Brazil

In new street additions, Hajja built increasingly disconnected streets from 1975 through 1991-2005, then improved, while Qaryat Salah al Din fluctuated in its street-construction patterns and Chandipur built increasingly connected streets from 1975 through 1976-1990, then shifted to more disconnected patterns. For the full network, Hajja grew more disconnected from 1975 through 1991-2005, then improved, while Qaryat Salah al Din fluctuated in connectivity and Chandipur became more connected from 1975 through 1976-1990, then grew more sprawly from 1976-1990 onwards. Notably, Hajja had a more connected network than Chandipur in 1975 but the two have since reversed their relative ranking.