Inadequate rear/tail light illumination in bad weather.

I was a passenger in my friend’s car travelling towards Shrewsbury via the M54, and the weather was awful, absolutely hoofing it down, and of course was stunned by the amount of idiot drivers with no lights on, and those whom think their daytime running lights also illuminate the rear, where on most cars they don’t. Anyway, a fellow Edge driver was tootling along on the inside lane without his lights on, or so I thought. As we approached it, became apparent they were on, but barely visible. I could make out they were on, and the lights across the boot lid.

We were about 10 feet away on the outside lane when he took the exit towards Telford. I was appalled on how poor the illumination was compared to other vehicles, the car in front of him was a VW T-ROC and that was perfectly visible, and were so many other vehicles without the need for their fog lights.

I’m not sure if they are affected by it not being night, so don’t illuminate as much, or when activated by the auto-wipers, either way.
I’d recommend turning on your rear fog lights in heavy rain.