'Pokemon Go' Buddy System Guide: Safe Speed For Trainer – Faster Than 'Ingress'? Speed Tracker App Available
http://www.itechpost.com/articles/29000/20160912/pokemon-go-buddy-system-guide-safe-speed-trainer-faster-ingress.htm
“Pokemon Go” buddy system has a speed limit that is similar to the speed limit for hatching eggs, which is around 10.5km per hour or 65 miles per hour.