I thought for sure that the MPH sign mission would be won by a military person stationed overseas. On many US military installations overseas, the posted speed limit in MPH will be a conversion from whatever the posted speed is in km/h. So, if the posted km/h speed 30...it will be on a European speed limit sign, with a US speed limit sign nearby reading 19 MPH (or whatever the closest MPH is to the posted km/h).
Dan