(AP) -- The NFL's one-year experiment with the new kickoff rule becomes permanent this season with a new tweak that the league hopes will lead to a bigger increase in the rate of returns.

The league also approved changes to the overtime rule, expanded replay assist and made a few other technical changes for this season. Those were on display during the exhibition opener Thursday night between the Detroit Lions and Los Angeles Chargers that also featured the NFL's Hawk-Eye virtual measuring that replaced the old-time chains to determine first downs.

The league experimented with the so-called dynamic kickoff in 2024 in hopes of more returns while also making the play safer. Owners voted in April to make the change permanent while moving touchbacks on kicks that reach the end zone on the fl

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