It would be really cool to add synced lighting for ELS, similar to systems like Whelen V2V Sync or Federal Signal On-Scene Sync. Whelen systems already do this sometimes in real life, where lights automatically sync with other vehicles on scene. Having ELS always sync with your department’s vehicles would make scenes way less chaotic and much easier to navigate. It’d also look more realistic and polished, and overall be a solid quality-of-life upgrade that improves the experience for everyone playing.

Reference
https://www.youtube.com/watch?v=JamyZcnFaIM