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Classic trials, or colloquially mud plugging, is one of the oldest forms of 
Specific forms of car trials are ''PCTs'' (production car trials), for (road legal) production cars with minimal modification, and on the other hand ''sporting trials'' for special "flyweight" vehicles. These trials are restricted to one off-road trial route, without any road mileage sections.
Classical Gas
— Classic Trialling
Association of Classic Trials Clubs
— Rules and Regulations for one day Classic Trials and an article on the history of the sport.
The Motor Cycling Club
— Despite the name the MCC organise the three overnight trials. {{sportscar-autoracing-stub Auto racing by type
rallying
Rally is a wide-ranging form of motorsport with various competitive motoring elements such as speed tests (often called ''rally racing),'' navigation tests, or the ability to reach waypoints or a destination at a prescribed time or average speed. ...
or off-road
Off-roading is the activity of driving or riding in a vehicle on unpaved surfaces such as sand, gravel, riverbeds, mud, snow, rocks, and other natural terrain. Types of off-roading range in intensity, from leisure drives with unmodified vehicl ...
motor sport
''Motor Sport'' is a monthly motor racing magazine, founded in the United Kingdom in 1924
as the ''Brooklands Gazette''. The name was changed to ''Motor Sport'' for the August 1925 issue. The magazine covers motor sport in general, although from ...
s, dating from the beginning of the 20th century. Originally, the challenge was just to complete a long (challenging) road course. All three Motor Cycling Club
The Motor Cycling Club (MCC) is a British motorsports and Motorcycle sport club formed in 1901. It is the second oldest motorcycle club in Great Britain. It is a member of both the Motor Sports Association (cars) and Auto-Cycle Union (bikes). ...
long distance trials in the UK – the Land's End
Land's End ( kw, Penn an Wlas or ''Pedn an Wlas'') is a headland and tourist and holiday complex in western Cornwall, England, on the Penwith peninsula about west-south-west of Penzance at the western end of the A30 road. To the east of it is ...
, the Exeter
Exeter () is a city in Devon, South West England. It is situated on the River Exe, approximately northeast of Plymouth and southwest of Bristol.
In Roman Britain, Exeter was established as the base of Legio II Augusta under the personal comm ...
and the Edinburgh
Edinburgh ( ; gd, Dùn Èideann ) is the capital city of Scotland and one of its 32 Council areas of Scotland, council areas. Historically part of the county of Midlothian (interchangeably Edinburghshire before 1921), it is located in Lothian ...
– date from that time, and are still held today.
As vehicles became more reliable, the events became easier and the concept of ''observed non-stop'' sections was introduced. On these, the car or motorcycle is stopped at the foot of a hill and has to make a non-stop ascent.
On a classic trial today, there will typically be around fifteen of such "observed sections", mixed with between 40 to 400 miles of road course.
Specific forms of car trials are ''PCTs'' (production car trials), for (road legal) production cars with minimal modification, and on the other hand ''sporting trials'' for special "flyweight" vehicles. These trials are restricted to one off-road trial route, without any road mileage sections.
External links
Classical Gas
— Classic Trialling
Association of Classic Trials Clubs
— Rules and Regulations for one day Classic Trials and an article on the history of the sport.
The Motor Cycling Club
— Despite the name the MCC organise the three overnight trials. {{sportscar-autoracing-stub Auto racing by type