a-b: Distribution of actual travel time for ART receiving population (a - top), Median actual (orange line) and potential (green line) travel time (b - bottom). Travel times estimated using travel time surface in Figure 1. Note Figure 4b: The green line shows Potential Travel Time (PTT) if all people receiving ART went to their nearest clinic. The orange line shows the estimated Actual travel Time (ATT). Error bars show 95% confidence intervals for the median (using bootstrapping). The proportions below the green line indicate the proportion of patients not attending their nearest clinic.