Route 66 is a visual aesthetic centered on the romanticized era of American autotourism along the historic U.S. Route 66 (decommissioned in 1985). The style primarily reflects the short-lived boom of roadside culture that flourished from the 1950s to the 1960s. The aesthetic is a nostalgic celebration of freedom, autonomy, and the kitschy, exaggerated architectural styles designed to lure the newly mobile American traveler off the highway.

The aesthetic often overlaps with Greaser culture and the broader Hot Rod / Kustom Kulture , utilizing motifs like classic cars and "greasy spoon" diners.

The aesthetic romanticizes the period when the Mother Road was the symbol of westward expansion and the American Dream; the promise of a better life in California, particularly for Dust Bowl migrants (cemented by The Grapes of Wrath). Today, its appeal is not necessarily based on genuine nostalgia, but rather the appreciation of kitsch —the visible, commodified imitation of a simpler past, which has itself become a unique modern tourist attraction.

The visual canon of the Route 66 aesthetic is defined by the juxtaposition of the vast, dusty American Southwest with garish, eye-catching artificial structures.

The core iconography of the aesthetic is based on attention-grabbing architecture designed to be seen at high speeds:

The palette juxtaposes natural and artificial colors. Neon signs are paramount, with highly detailed, often animated mid-century signage contrasted against the deep black of the desert night. The aesthetic is otherwise dominated by a desert palette of dusty browns and reds, accented by the pastel hues (pink, mint green) and chrome silver of the period's automobiles.

The aesthetic is heavily associated with the earliest forms of rock 'n' roll and music that explicitly celebrates the American road trip.

The sonic backdrop is defined by the early Rock 'n' Roll era (1950s) and instrumental music that evokes the feeling of driving: