With the first two days of Dallara IR28 testing beset by rain at the Indianapolis Motor Speedway’s road course, the IndyCar Series made a brief return to complete 25 laps of dry running Tuesday evening with Alex Palou.

Scott Dixon was encouraged by his first experience with IndyCar's prototype windscreen after completing the first of three scheduled test runs at Phoenix on Thursday.Dixon completed half a dozen laps in the initial run, which was intended to test the 0.4-inch thick windscreen's performance in bright light. The second and...