Fig. 3: Relationship of between subway ridership, crowdedness, and length with key socioeconomic factors in the selected 25 cities with the world’s busiest subway lines. | Humanities and Social Sciences Communications

Fig. 3: Relationship of between subway ridership, crowdedness, and length with key socioeconomic factors in the selected 25 cities with the world’s busiest subway lines.

From: Global urban subway development, construction material stocks, and embodied carbon emissions

Fig. 3

(a) Subway ridership and population density; (b) Subway crowdedness and population density; (c) Subway length per capita and population density; and (d) Subway length per capita and GDP per capita. The five selected Chinese cities are shown in the inner figures of (c) and (d), due to available historical data.

Back to article page