What are the circuit types in INDYCAR?

Section 3: Playing Area

INDYCAR is unusual among major championships in racing on three fundamentally different kinds of circuit within a single season:

Ovals: Ranging from the 2.5-mile Indianapolis Motor Speedway superspeedway to short ovals under one mile. Cars run the low-downforce superspeedway aero kit on the fastest ovals.
Permanent road courses: Purpose-built circuits with left and right corners, elevation change, and run-off areas.
Temporary street circuits: Laid out on public roads, lined by concrete walls with limited run-off, demanding precision and rewarding track position.

Pit lane runs parallel to the start/finish straight and is divided into team pit boxes assigned by the rulebook's order (often by championship position or qualifying).
A strictly enforced pit lane speed limit applies whenever the pits are open; cars are monitored electronically.
Pit entry and exit are defined by lines on the track; crossing them improperly, or work performed outside the assigned box, is penalized.

Start/finish line and electronic timing loops placed around the circuit record each car's position and lap and sector times.
Flag stations are positioned around the circuit; flags (green, yellow, red, white, checkered, blue, black, and the warning flags) communicate track status to drivers.
On road and street courses, corner markings, apex curbs, and track-limit lines define the racing surface; on ovals, the apron, racing groove, and warm-up lane are defined areas.

INDYCAR is unusual among major championships in racing on three fundamentally different kinds of circuit within a single season:

Ovals: Ranging from the 2.5-mile Indianapolis Motor Speedway superspeedway to short ovals under one mile. Cars run the low-downforce superspeedway aero kit on the fastest ovals.
Permanent road courses: Purpose-built circuits with left and right corners, elevation change, and run-off areas.
Temporary street circuits: Laid out on public roads, lined by concrete walls with limited run-off, demanding precision and rewarding track position.

Pit lane runs parallel to the start/finish straight and is divided into team pit boxes assigned by the rulebook's order (often by championship position or qualifying).
A strictly enforced pit lane speed limit applies whenever the pits are open; cars are monitored electronically.
Pit entry and exit are defined by lines on the track; crossing them improperly, or work performed outside the assigned box, is penalized.

Start/finish line and electronic timing loops placed around the circuit record each car's position and lap and sector times.
Flag stations are positioned around the circuit; flags (green, yellow, red, white, checkered, blue, black, and the warning flags) communicate track status to drivers.
On road and street courses, corner markings, apex curbs, and track-limit lines define the racing surface; on ovals, the apron, racing groove, and warm-up lane are defined areas.