For the most part, races were run over a lengthy circuit of closed public roads, not purpose-built private tracks. This was true of the
Le Mans circuit of the 1906
Grand Prix, as well as the (run on of Sicilian roads), the German circuit in the
Taunus mountains, and the French circuit at
Dieppe (a mere ), used for the
1907 Grand Prix. The exceptions were the steeply banked egg-shaped near oval of
Brooklands in
England, completed in 1907; the
Indianapolis Motor Speedway, first used in 1909 with the first
Indianapolis 500-Mile Race in 1911; and the , in
Italy, opened in 1922. In 1908, the
United States of America became the first country outside France to host an automobile race using the name Grand Prix (or Grand Prize), run at Savannah. The first outside France was the 1921
Italian Grand Prix held at
Montichiari. This was quickly followed by
Belgium and
Spain (in 1924), and later spread to other countries including Britain (1926). Strictly speaking, this still was not a formal championship, but a loose collection of races run to various rules. (A "formula" of rules had appeared just before
World War I, finally based on engine size as well as weight, but it was not universally adopted.) In 1904, many national motor clubs banded together to form the (
AIACR). In 1922 the (CSI) was empowered on behalf of
AIACR to regulate Grand Prix racing and other forms of international racing. Since the inception of Grand Prix racing, competitions had been run in accordance with a strict formula based on engine size and vehicle weight. These regulations were virtually abandoned in 1928 with an era known as
Formula Libre when race organisers decided to run their events with almost no limitations. From 1927 to 1934, the number of races considered to have Grand Prix status exploded, jumping from five events in 1927, to nine events in 1929, to eighteen in 1934 (the peak year before
World War II). During this period a lot of changes of rules occurred. There was a mass start for the first time at the
1922 French Grand Prix in Strasbourg. The
1925 season was the first season during which no
riding mechanic was required in a car, as this rule was repealed in Europe after the death of
Tom Barrett during the
1924 Grand Prix season. At the in
1926 a well thought-out system, with flags and boards, giving drivers tactical information, was used for the first time by
Alfred Neubauer, the racing manager of the
Mercedes-Benz team. The
1933 Monaco Grand Prix was the first time in the history of the sport that the grid was determined by timed qualifying rather than the luck of a draw. == Pre-World War II years ==