Official practice started at 2pm ET and the day's running has been extended by one hour to 7pm, to make up for a delayed start due to rain.

Refinements to the 2016 Verizon IndyCar Series rulebook, distributed to teams and suppliers Dec. 19, clarify procedures established in the past two seasons and highlight ongoing efforts to improve the overall fan experience in the upcoming season. Areas of interest in the rulebook include the following: Aero Kits• IndyCar has...