This design very nearly made the cutting room floor in my recent re-assessment of things. But I'm just too fond of the driver.... a bit Monsieur Hulot meets Mr Magoo.
The main problem with it is that it usually requires two firings in the kiln - the black of the tyres often has lighter patches with only one firing, so needs to be touched-up and fired again. I guess I should investigate the possibility of using kiln-firable glass transfers for certain designs, but then it begs the question, why not use them for all the designs? Hmm, but where would be the fun in that...?