Life360 may occasionally display a very high speed that seems unreasonable for the conditions.
We consider the speed reported in the app to be reasonably accurate, but because of the sampling of location points, it may miss points in your trip.
This may cause the app to see a trip from point A to point B happen in a shorter period of time, thereby showing a higher speed than was actually driven.
This is not common and does not explain every high-speed event. Sometimes high speed is actually high speed.
We are always working to improve the accuracy of the app. Accuracy is determined in large part by the strength of the signal and data connection to the app. A weaker signal will produce less accurate results. We recommend always keeping Wifi turned on to increase accuracy, even when a connection to Wifi is not available.