Right, and gravity can be creatively applied as well.

Short-range (100-1000m) off-grid capability, or unpowered downhill segments (relying on regenerative braking to battery storage) can further reduce infrastructure needs.

There are battery-powered truck schemes relying on empty uphill returns for quarry and forestry applications. Effectively the load itself is the potential energy source and charges batteries via regenerative braking.

Clever, but of limited application.

This is already being tested and used for buses in cities, where it makes even more sense due to shorter distances on mostly predictable routes.