Helio Castroneves said he once got pulled over while driving in the triple digits, recalling an officer warning he could face serious consequences.
The 51-year-old Brazilian said he used to be stopped frequently when he was younger, but added that having a daughter—now 16—made him slow down and "behave" on public roads.
Rental cars are another brake on his speed, Castroneves said, because low-mileage vehicles are hard to find and he avoids pushing beat-up cars for fear of breaking down.
Castroneves heads into Sunday's Indianapolis 500 seeking a record fifth victory after already winning the race four times; the start is scheduled for 12:45 p.m. ET.
Can 51-year-old Castroneves defy a 15th-place start and a rainy forecast to clinch his record fifth Indy 500 win?
What is Helio Castroneves's greatest advantage against younger rivals as he chases his historic fifth Indianapolis 500 victory?
How has co-owning his team changed Castroneves's strategy for capturing the elusive fifth Indy 500 title?