A motorcycle (bike, motorbicycle, cycle or motorbike) is a single-track, two-wheeled motor vehicle powered by an engine. Motorcycles vary considerably depending on the task for which they are designed, such as long distance travel, navigating congested urban traffic, cruising, sport and racing, or off-road conditions. In many parts of the world, motorcycles are among the least expensive and most widespread forms of motorised transport.

A motorcycle is broadly defined by law in some countries for the purposes of registration, taxation or licensing riders as a two-wheel motor vehicle "fit to drive." Other countries distinguish between mopeds and other small bikes and the larger, more powerful vehicles. In Canada and some U.S. jurisdictions, three-wheeled motor vehicles fall under the auspices of motorcycle regulations.

In the United Kingdom, the rules on which motorcycle may be ridden by whom are complex. A "moped", which can be ridden at age 16, has a maximum design speed not exceeding 50 km/h (31 mph) and engine capacity no greater than 50 cc. A "learner motorcycle", which can be ridden from age 17, has an engine up to 125 cc with a power output not exceeding 11 kW (15 hp). Only a Compulsory Basic Training (CBT) licence is needed to ride a learner motorcycle with an L plate. A "large restricted motorcycle" has a power output of not more than 25 kW (34 hp). Riders are restricted to riding large restricted motorcycles or smaller for two years after passing their initial motorcycle test. A "large motorcycle" has a power output of at least 25 kW.

For riders over age 21 there is a direct access route to gaining a licence to ride a large motorcycle, which allows somebody with no motorcycle experience to train and pass a test in around five days. All motorcycle riders in the UK must first take a one-day CBT course, regardless of which class of motorcycle they intend to ride. In addition a theory test must be taken prior to taking a practical test for any type of motorcycle licence.

In the United States, licencing requirements vary widely among the states and territories, but generally riders are required to pass written and practical (on-cycle) competency tests. In about half the states, successful completion of a rider education course (such as those offered by the Motorcycle Safety Foundation) is accepted by state licencing agencies in lieu of examination.

In New Zealand, "learner" and "restricted" motorcycles may only have a 250 cc engine capacity. This distinction draws some criticism, as it allows 15-year-old learner riders to operate bikes capable of reaching speeds in excess of 250 km/h (160 mph).

The legal age to be eligible to apply for a New Zealand motorcycle licence is 15 years and over. New Zealand employs a three stage system for motor vehicle licensing. At age 15, an individual can gain their first licence known as their "learner licence". They must hold this for at least 6 months before they are able to move on to their "restricted licence". They must then hold this "restricted licence" for one and half years. After a period of 6 to 18 months, depending on age and additional training, a holder of a restricted licence may sit the third and final stage known as the "full licence". Until an individual has their "full licence" they are only able to ride a motorcycle which has an engine capacity of 250 cc or less.

A similar system is used in most states of Australia, with some variations. "Learners Permit" and "Provisional" license holders must not have bikes that exceed a power to weight ratio of 150kW/tonne or 660cc, whichever comes first. All 250cc bikes (with a few listed exceptions) are automatically included in this LAMS (Learner Approved Motorcycle Scheme) list.

Before getting a "Learners Permit" a Pre-Learner course is required, which issues a certificate of completion, valid for 3 months. Upon passing a computer test, the rider is granted a Learners Permit, which is valid for 12 months. Whilst on a learners permit, the rider may not carry a pillion or side car and may not exceed 80km/h or the posted speed limit, whichever is lower.

To progress to a Provisional License, the rider must successfully complete a Pre-Provisional riders course, followed by a riding skills test called MOST (Motorcycle Operator Skill Test). The rider is then able to obtain a "Provisional License". Provisional licenses can be renewed and must be held without suspension for 12 months, after which time it can be upgraded to a full license.

The laws of some countries allow anyone with a car licence to legally ride mopeds not exceeding 50 cc in capacity, meaning that they do not need to show any competency in handling such a vehicle.

The laws and regulations for legal moped usage in the U.S. vary by state. The specifics of the motorcycle and moped laws in the U.S. can be obtained from each individual state's Department of Motor Vehicles' websites.

Wikipedia:Motorcycle Legal definitions and restrictions

Mountain Highway (also known as Wantirna-Sassafras Road) is a 18km highway in Eastern Melbourne. Mountain Highway starts from Burwood Highway and runs through The Basin, then uphill to Sassafras. For most of its length it is dual carriageway, with 2 or 3 lanes in each Direction. From Burwood Highway to Forest Road in the suburb of The Basin, the highway is generally straight. From The Basin to Sassafras, the road traverses through the Dandenong Ranges National Park, eventually terminating at Mt. Dandenong Tourist Road and is a challenging winding road and a popular cycling and motorcycling route for people in Melbourne.

Motorcycles have a higher rate of fatal accidents than automobiles. United States Department of Transportation data for 2005 from the Fatality Analysis Reporting System show that for passenger cars, 18.62 fatal crashes occur per 100,000 registered vehicles. For motorcycles this figure is higher at 75.19 per 100,000 registered vehicles – four times higher than for cars. The same data show that 1.56 fatalities occur per 100 million vehicle miles travelled for passenger cars, whereas for motorcycles the figure is 43.47 – 28 times higher than for cars. Furthermore for motorcycles the accident rates have increased significantly since the end of the 1990s, while the rates have dropped for passenger cars.

The two major causes of motorcycle accidents in the United States are: motorists pulling out or turning in front of motorcyclists and violating their rights-of-way and motorcyclists running wide through turns. The former is sometimes called a SMIDSY, an acronym formed from the motorists' common response of "Sorry mate, I didn't see you". The latter is more common when motorcyclists mix drinking with riding. Motorcyclists can anticipate and avoid some of these crashes with proper training, increasing their conspicuousness to other traffic, and separating alcohol and riding.

The United Kingdom has several organisations which are dedicated to improving motorcycle safety by providing advanced rider training over and above what is necessary to pass the basic motorcycle test. These include the Institute of Advanced Motorists (IAM) and the Royal Society for the Prevention of Accidents (RoSPA). Along with increased personal safety, riders with these advanced qualifications often benefit from reduced insurance costs.

Motorcycle Safety Education is offered throughout the United States by organisations ranging from state agencies to non-profit organisations to corporations. The courses, designed by the Motorcycle Safety Foundation (MSF), include a Basic Rider Course, an Intermediate Rider Course and an Advanced Rider Course.

In the UK and some Australian jurisdictions, such as New South Wales, the Australian Capital Territory and the Northern Territory, it is compulsory to undertake a rider training course before being issued a Learners Licence.

In Canada, motorcycle rider training is compulsory in Quebec and Manitoba only, but all provinces and territories have Graduated Licensing programs which place restrictions on new drivers until they have gained experience. Eligibility for a full motorcycle license or endorsement for completing a Motorcycle Safety course varies by province. The Canada Safety Council, a non-profit safety organisation, offers the Gearing Up program across Canada and is endorsed by the Motorcycle and Moped Industry Council. Training course graduates may qualify for reduced insurance premiums.

Wikipedia:Motorcycle safety and Motorcycle safety clothing