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. 2017 Jul 13;135(7):715–721. doi: 10.1001/jamaophthalmol.2017.1153

Figure 4. Driving Time to North Carolina Diabetic Retinopathy Telemedicine Network Sites.

Figure 4.

Travel time map allows for visualization of potential access barriers based on number and type of surface roads surrounding each clinic. Twenty-minute service area represents all areas that can be reached within 20 driving minutes. Forty-minute service area contains all areas that can be reached between 20 and 40 driving minutes. Sixty-minute service area contains all areas that can be reached between 40 and 60 driving minutes. Maps generated by Esri, HERE, DeLorme, MapmyIndia, USGS, NOAA, NPS, OpenStreetMap contributors, and the GIS user community.