Can I get a detailed explanation on how the Drivetime Analysis tool produces its outcome? Is it using some sort of Road Network Dataset that recognizes the MPH of the roads? Just curious because I ran a 15 min analysis and noticed there was a gap missing (def within 15 min from Point provided). The gap contained secondary roads in a rural area and Im assuming the Network Dataset hasn't gotten that far with the info. Any info would be awesome, thanks community!