I thought of something: Magical electric carriages. Basically, a mode of transport that's electric, powered by a Lightning Wielder. If you're familiar with the manga/anime Fairy Tale, you'll know what I'm talking about here - they have carriages that are powered by a mage channeling energy into it to make it go. The same principle applies here - the Wielder channels electricity to make it go. Assuming I can figure out how it works... But still, that alone would have a huge effect on the culture - ease of transport, more roads would be cobbled/smoother to facilitate the carriages, and other things that I haven't yet thought of.
