You’re in traffic court, arguing against a speeding citation. You entered a 220-m-radius banked turn designed for 81km/h, which was also the posted speed limit. The road was icy, yet you stayed in your lane, so you argue that you must have been going at the design speed. But police measurements show there was a frictional coefficient 0.16 between tires and road.
Is it possible you were speeding? What’s the maximum possible speed?