Compounds of the general formula, wherein the substituents are as defined in claim 1, are useful as fungicides. The invention also relates to a method for preparing aqueous or hydro-organic formulations containing polyhydroxy-urethanes, and to the use of said polyhydroxy-urethanes and of said aqueous or hydro-organic formulations. The vehicle driver may be commanded to vary a control input, such as accelerator pedal position, in order to facilitate the maintaining of progress.