Overview: From Press Day at the Frankfurt Motor Show — William Woollard and Sue Baker report the latest cars. Frank Page drives the new medium-sized Peugeot 405. On the road, there are test reports on the BMW V12, Mercedes Coupe and Porsche 959. You can still drive as fast as you like on the German autobahn, but is it just too dangerous? Chris Goffey reports on the political pressure to slow down.