F1 Nation F1 Explains: flashing lights, fast fixes + F1 engine customers
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Mar 13, 2026 Lawrence Barretto, F1 correspondent and presenter who explains technical and sporting topics, breaks down the new flashing rear lights and battery recharging. He unpacks Boost versus Overtake modes and how active aero changes passing. He also explains why manufacturers currently have an edge and how mechanics pull off lightning-fast front-wing rebuilds.
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Red Light Shows Battery Recharge State
- The new rear red flashing light signals MGUK battery recharge states to following drivers instead of just braking.
- One flash means reduced delivery, two means stopped, and multiple quick flashes show active recharging on straights.
Boost Versus Overtake Differentiated
- Boost is a driver-controlled function to sustain maximum electrical power for longer on a straight and can be used anywhere on the lap.
- Overtake is a state triggered by following within one second that lets you recover more energy to combine with boost for passes.
Active Aero Opens For All Cars On Straights
- Active aero flaps open for the entirety of designated straight zones for every car, independent of proximity to another car.
- Being within a second adds a battery advantage (overtake state), not aerodynamic access like old DRS.