This morning in Gloucestershire thick fog. My Jazz dipped headlights, intermittent wipers and no I didn't use rear fog as a Nissan Leaf was close behind. I saw 3 Nissan Leafs in the 17 mile journey, none had lights on apart from the daytime running lights so no rear lights. The leaf following me had an invisible driver, he did one wipe in 10 miles (that I could see) and disappeared from view behind the buildup of moisture on his windscreen. I confess I was unnerved, the only saving grace was the front car in a series of about 10 (convoy) was only doing about 30mph. I understand battery saving but these EV drivers are acting in a very irresponsible manner not using lights in fog.