This seems like a huge amount of effort to get malware onto a computer. While it seems technically plausible, the steps involved (getting a compromised app onto devices, harvesting contact and location data, waiting for a subset of the infected population to speed, then delivering more malware to them via email) makes me rather dubious.
Also.. "waiting for a subset of the infected population to speed" I'm gonna go ahead and say that subset is about 99% of the population. Even if you don't speed, like most people do, there's plenty of areas for this malware to "catch" you, like when the speed limit drops unexpectedly or you are not sure of it when pulling on to a road.