Fig. 9.

Coverage functions used for sensitivity analysis. Piecewise linear: $f_{\text{pl}}(d)={\sum }_{t\in T}{w}_{t}max\{1-\frac{d}{r_t},0\}$. Sigmoid: $f_{\text{sigmoid}}(d)={\sum }_{t\in T}\frac{w_t}{1+exp(12r_t-6)}$. Binary: 1 between 0m and 310m, 0 otherwise. Exponential: $f_{\text{exponential}}(d)={\sum }_{t\in T}{w}_t{\mathrm{e}}^{-{\beta }_{t}d}$ with coefficients ${\beta }_{\text{walking}}=0.02$, ${\beta }_{\text{cycling}}=0.0085$, and ${\beta }_{\text{driving}}=0.0012$