Figure 8
From: Estimation and monitoring of city-to-city travel times using call detail records
Comparison of our estimates with Google’s Distance Matrix API estimates. Only estimates based on at least 10,000 inter-observation times are shown. In Panel A, we show our results for the lower bound estimate, and in Panel B, we show our results for the peak estimate. Google’s estimates tend to be overall smaller than ours. This is most evident with longer distances, and indicates that Google seems to systematically overestimate travel speeds in Senegal.