I don’t particularly recall discussing this issue, but I surely can inquire. Nevertheless, if I may be so bold as to predict the response, it would be along the lines Kol Hakovod to the various Rabbonim of the kehilos that have established this heilige takana in upholding tznius. (Not implying that other kehilos are obligated to follow suit.)
I do know that the Rebbetzin has never driven.