No it's more like, they look vulnerable as they aren't wearing a helmet I'll give them some extra room. I was amazed by the extra space I got when cycling with a child seat on the back of my bike.

Cost per kW is still most important with PV. Sunlight is free and most people struggle to afford to cover their whole roof so £/kW installed capacity is the key metric. Improving efficiency is great, but if the cost uplift is more than the efficiency uplift, then it's not that useful... Yet! I'm sure they'll eventually get the price down.

Wearing a helmet might also might make some drivers drive closer to you and with less care. So it might help make some accidents less severe, but it also might make the chance of a serious accident more likely. It's not as straightforward as many seem to think.