Take a look at our favorite pictures from the recent IndyCar test at Sonoma Raceway in California.
Five teams including defending champions Team Penske, Schmidt Peterson and AJ Foyt Racing rolled out their new for 2018 universal aero kits and liveries at the Californian road course.
Teams will next run on 9 and 10 February at ISM Raceway in Phoenix for the IndyCar open test.
You can watch the live stream of the test – starting at 3pm and 8pm (ET) each day here at MotorSportNotes.com
All images: IndyCar