Many early rallies were called trials, and a few still are, although this term is now mainly applied to the specialist form of motor sport of climbing as far as you can up steep and slippery hills. And many meets or assemblies of car enthusiasts and their vehicles are still called rallies, even if they involve merely the task of getting there (often on a trailer).
Road rallies are the original form, held on highways open to normal traffic, where the emphasis is not on outright speed but on accurate timekeeping and navigation and on vehicle reliability, often on difficult roads and over long distances. They are now primarily amateur events. There are several types of road rallies testing accuracy, navigation or problem solving. Some common types are: Regularity rally or a Time-Speed-Distance rally (also TSD rally, testing ability to stay on track and on time), others are Monte-Carlo styles (Monte Carlo, Pan Am, Pan Carlo, Continental) rally (testing navigation and timing), and various Gimmick rally types (testing logic and observation).
In 1980, a German car maker, Audi, at that time not noted for their interest in rallying, introduced a rather large and heavy coupé version of their family saloon, installed a turbocharged 2.1 litre five-cylinder engine, and fitted it with four-wheel drive. Thus the Audi Quattro was born. International regulations had prohibited four-wheel drive; but FISA accepted that this was a genuine production car, and changed the rules. The Quattro quickly became the car to beat on snow, ice or gravel; and in 1983 took Hannu Mikkola to the World Rally Championship title. Other manufacturers had no production four-wheel drive car on which to base their response, so FISA was persuaded to change the rules, and open the Championship to cars in Group B. This allowed cars to be much further removed from production models, and so was created a generation of rallying supercars, of which the most radical and impressive were the Peugeot 205 T16, Renault 5 Turbo and the Lancia Delta S4, with flimsy fibreglass bodies roughly the shape of the standard car tacked onto lightweight spaceframe chassis, four-wheel drive, and power outputs reportedly as high as 600 hp (450 kW). Further Group B cars were developed by Ford (the RS200), British Leyland (the Metro 6R4) and many others, but these were less successful.
In the 1920s, numerous variations on the Alpine theme sprang up in Austria, Italy, France, Switzerland and Germany. The most important of these were Austria's Alpenfahrt, which continued into its 44th edition in 1973, Italy's Coppa delle Alpi, and the Coupe Internationale des Alpes (International Alpine Trial), organised jointly by the automobile clubs of Italy, Germany, Austria, Switzerland and, latterly, France. This last event, run from 1928 to 1936, attracted strong international fields vying for an individual Glacier Cup or a team Alpine Cup, including successful Talbot, Riley, MG and Triumph teams from Britain and increasingly strong and well funded works representation from Adolf Hitler's Germany, keen to prove its engineering and sporting prowess with successful marques like Adler, Wanderer and Trumpf.
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.