Older models such as the Honda C50 used a simple centrifugal governor as part of the transmission, which progressively and severely advanced the ignition as speed rose past a set point, causing engine power to fall off rapidly at higher rpm and road speed, but maintaining the low- and moderate-speed hill climbing ability of the unrestricted version.
Other systems achieved a similar result with simple restrictor flaps in the air intake, much like those used to restrict the power output of full-size motorcycles.
Modern electronic limiters at the very least require replacing the friction rollers in a scooter's CVT, or even changing wheel size and/or reprogramming the engine management system, all in an effort to fool the sensors into detecting a lower than actual road speed.
Scheduled coach services in the United Kingdom (and also bus services) are limited to either 65 mph (105 km/h) or 100 km/h (62 mph) depending on their age (newer coaches have the lower speed version installed, in line with harmonised EU regulations), though for city buses the use of limiters is to satisfy regulatory requirements, as many city buses cannot achieve these speeds even on an open roadway.
Top Speed Mode, as Bugatti dubs it, reduces the overall ride height and lowers the rear spoiler to help in the reduction of drag.
[11] In European markets, General Motors Europe sometimes allow certain high-powered Opel or Vauxhall cars to exceed the 250 km/h (155 mph) mark, whereas their Cadillacs do not.
Many small and medium-sized commercial vehicles are now routinely fitted with speed limiters as a manufacturer option, with a mind towards reducing fuel bills, maintenance costs and insurance premiums, as well as discouraging employees from abusing company vehicles, in addition to curbing speeding fines and bad publicity.
),[opinion] and to safeguard their small engines from the prolonged overrevving required to produce the power to achieve higher speeds.
[citation needed] All Dodge Challenger and Charger models from the 2015 model year and up received a security update in June 2021, that allows you to set a security code that if you type the incorrect code, the RPM is limited idle speed (3 hp, 2 mph (3 km/h), and 66 lb⋅ft (89 N⋅m) of torque) to deter thieves.