As public interest grew, car companies started to introduce special models or variants for rallying, such as the British Motor Corporation's highly successful Mini Cooper, introduced in 1962, and its successor the Mini Cooper S (1963), developed by the Cooper Car Company. Shortly after, Ford of Britain first hired Lotus to create a high-performance version of their Cortina family car, then in 1968 launched the Escort Twin Cam, one of the most successful rally cars of its era. Similarly, Abarth developed high performance versions of Fiats 124 roadster and 131 saloon.
Rallying is also unique in its choice of where and when to race. Rallies take place on all surfaces and in all conditions: asphalt (tarmac), gravel, or snow and ice, sometimes more than one in a single rally, depending on the course and event. Rallies are also run every month of the year, in every climate from bitter cold to monsoonal rain. As a result of the drivers not knowing exactly what lies ahead, the lower traction available on dirt roads, and the driving characteristics of small cars, the drivers are much less visibly smooth than circuit racers, regularly sending the car literally flying over bumps, and sliding the cars out of corners.
The causes and characteristics of rallies vary, but most financial theorists agree that economic cycles and investor sentiment both play a role in the creation and momentum of rallies. In general, information about a strong or strengthening economy, indicated by high employment, high disposable income, low inflation and high business profits usually ushers in a rally. The existence of several new trading highs for well-known companies also indicates a rally is occurring. It is important to note that government involvement affects rallies: Changing the federal funds rate or tax rates indirectly encourages economic expansion or contraction.
In Britain, the legal maximum speed of 12 mph (19 km/h) precluded road racing, but in April and May 1900, the Automobile Club of Great Britain (the forerunner of the Royal Automobile Club) organised the Thousand Mile Trial, a 15-day event linking Britain's major cities, in order to promote this novel form of transport. Seventy vehicles took part, the majority of them trade entries. They had to complete thirteen stages of route varying in length from 43 to 123 miles (69 to 198 km) at average speeds of up to the legal limit of 12 mph (19 km/h), and tackle six hillclimb or speed tests. On rest days and at lunch halts, the cars were shown to the public in exhibition halls.[unreliable source?] This was followed in 1901 by a five-day trial based in Glasgow The Scottish Automobile Club organised an annual Glasgow–London non-stop trial from 1902 to 1904, then the Scottish Reliability Trial from 1905. The Motor Cycling Club allowed cars to enter its trials and runs from 1904 (London–Edinburgh, London–Land's End, London–Exeter—all still in being as mud-plugging classic trials). In 1908 the Royal Automobile Club held its 2,000 mi (3,200 km) International Touring Car Trial, and 1914 the important Light Car Trial for manufacturers of cars up to 1400 cc, to test comparative performances and improve the breed. In 1924, the exercise was repeated as the Small Car Trials.
Rising investor confidence also indicates a rally, and it is perhaps more powerful than any economic indicator because when investors believe something is going to happen (a rally, for example), they tend to take action (purchasing shares in order to profit from expected price increases) that actually turn expectations into reality. Although it is an objective concept, investor sentiment shows through in mathematical measurements such as the put/call ratio, the advance/decline line, IPO activity, and the amount of outstanding margin debt.