NASCAR will mandate a new right side rear-window air deflector beginning with Saturday’s Coke Zero Sugar 400 at Daytona International Speedway (7:30 p.m. ET, NBC, Peacock, NBC Sports App, MRN Radio, ...

Corey LaJoie on the new right-side rear window fin/air deflector added to the cars after NASCAR analyzed video and data from LaJoie’s flip at Michigan.

Automotive styling is a strange creature. For decades, external windshield visors ruled the black top with one-piece metal shades, adorning the tops of many vehicles from about the 1940s. Some of ...