RoamAD tested VoIP at 130 kph in Arizona: RoamAD worked with Wi-VOD in Arizona using a Homeland Security grant to test whether multi-party VoIP calls could work at speeds up to 130 km/hour (about 80 mph): I'll save you the suspense. They did work just fine. The test bed is an 8-km stretch that placed RoamAD nodes less than 2 km apart. They'll build out 54 km (32 miles) by May.