Courtesy of Tony Otto

The exigencies of building a racetrack from scratch have made the United States Grand Prix a fluttery matter in motorsports circles. But the race at the Circuit of the Americas in Austin, Tex., is scheduled for Nov. 18, providing a platform for the Texas capital, American fans of Formula One and a tiny flag maker in the town of Nipomo, just inland from the central coast of California.

Dynamic DeZigns began negotiating with a representative of the circuit in February about supplying flags for the race, according to Tony Otto, the company president. In a telephone interview and subsequent e-mails, Mr. Otto said his company received the largest order in its 14-year history in May from Texas: 386 flags for corner marshals; two starter’s sets, each with nine flags; and additional banners to regulate traffic on the pit road.

Courtesy of Tony Otto

The F.I.A., the governing body of Formula One, sends top-ranking supervisors to every race on its calendar, but relies on national affiliates — in the case of the United States Grand Prix, the Sports Car Club of America — to provide race marshals to perform the flagging on raceday. An official at the S.C.C.A. acted as the intermediary between the circuit and Dynamic DeZigns, Mr. Otto said.

Aside from the familiar green to go, yellow to slow and checkered to finish, the uniform set of F.I.A. flags includes the international electric-blue to indicate drivers should move over, as well as the black-and-white opposing triangles to indicate unsportsmanlike conduct.

Dynamic DeZigns already provides flags to the IndyCar series as well as to managers of various road courses and short oval tracks around the country. Mr. Otto was hopeful that the Austin race would bring opportunities to supply other F.I.A.-sanctioned races, like the World Touring Car Championship at Sonoma, Calif., on Sep. 23. “This is another large feather in our cap,” said Mr. Otto, who has waved flags in drivers’ faces as an avocation since he was 16.

The company consists of Mr. Otto and his mother, Gay Otto, and a seamstress Martha King, who works from Victorville, Calif., in the state’s high desert north of San Bernardino. Mr. Otto, a facial-recognition software designer by day, declined to put a price tag on the order from the Circuit of the Americas, but said his avocation “barely” paid for itself.

The deal was locked when an example of every flag was produced for the approval of F.I.A. officials, who visited Austin in June, after the Canadian Grand Prix in Montreal. Shipping began last week.

The order posed a set of peculiar challenges to Dynamic DeZigns. Ms. King, the seamstress, was required to measure the ripstop nylon flag fabric in centimeters rather than inches. By F.I.A. standards, checkered and red flags must be cut to 80 centimeters by 100 centimeters, larger than other flags in a set. Additionally, the orange circle on the black flag, which indicates mechanical issues, must grow to 40 centimeters, about one-third larger than those used in national road racing. The fabric is treated with a fire-retardant coating that also prevents fraying.

Mr. Otto used the word “building” to describe the process of creating flags. After ordering 100-yard rolls of fabric, Ms. King performs piecing, stitching and hemming. The flags are then sent from Victorville to Nipomo for completion.

There, Ms. Otto trims away loose threads and fortifies the stitched corners with glue. Mr Otto performs finishing work on the 5/8″ wooden dowels used for handles. Velcro is added, and the dowels are sealed inside the flags’ headers, which are made of strong Cordura material.

The result: sets of flags stout enough to start hundreds of races, warn and disqualify stragglers and rule breakers, and hail all remaining finishers.