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When one of these errors occurs, usually it will turn on the "check engine" light on the dashboard. The Elections and Voting page, run by the Massachusetts Secretary of the Commonwealth office, allows residents to check their voter registration status online. Some construction vehicles have a two-part frame with a rugged hinge in the middle; this hinge allows the front and rear axles to become non-parallel to steer the vehicle. Opposing hydraulic cylinders move the halves of the frame relative to each other to steer. The more torque the driver applies to the steering wheel and column, the more fluid the valves allow through to the cylinder, and so the more force is applied to steer the wheels. The steering booster is arranged so that should the booster fail, the steering will continue to work (although the wheel will feel heavier). Francis W. Davis, an engineer of the truck division of Pierce-Arrow, began exploring how steering could be made easier, and in 1926 invented and demonstrated the first practical power steering system. Chrysler Corporation introduced the first commercially available passenger car power steering system on the 1951 Chrysler Imperial under the name "Hydraguide".

The Chrysler system was based on some of Davis' expired patents. 2002: Mercedes' "Pre-Safe" system was exhibited at the Paris Motor Show on the 2003 S-Class. The 2003 Civic Hybrid appears identical to the non-hybrid version, but delivers 50 miles per US gallon (4.7 L/100 km; 60 mpg-imp), a 40 percent increase compared to a conventional Civic LX sedan. Duffy, James E. (2003). Modern Automotive Technology (6th ed.). On the brake drum it is similar as the cylinder pushes the brake shoes against the drum which also slows the wheel down. The steering wheel operates valves to control flow to the cylinder. The controller computes the needed brake or acceleration force for each wheel and directs the valves of the hydraulic modulator. This enables shocks to adjust to road conditions and to control all of the unwanted motions that can occur in a moving vehicle, including bounce, sway, brake dive and acceleration squat. The ESC will automatically reactivate at highway speeds, and below such speeds if it detects a skid with the brake pedal depressed. Heavier vehicles, as are common in some countries, would be extremely difficult to maneuver at low speeds, while vehicles of lighter weight may not need power assisted steering at all.

Unlike other PRT systems, however, CVS also offered cargo vehicles, included "dual-use" designs that could be manually driven off the PRT network, and included the ability to stop at intersections in a conventional road-like network. Starting in the mid-1950s American manufacturers offered the technology as optional or standard equipment while it is widely offered internationally on modern vehicles, owing to the trends toward front-wheel drive, greater vehicle mass, reduced assembly line production costs, and wider tires, which all increase the required steering effort. A study in 1999 on the perceptual fidelity of steering force feedback, found that ordinary real-world truck and car drivers naturally expect an increase in feedback torque as speed increases, and for this reason early forms of power steering, which lacked such effect, were met with disapproval. Military needs during World War II for easier steering on heavy vehicles boosted the need for power assistance on armored cars and tank-recovery vehicles for the British and American armies.

Hydraulic power steering systems for cars augment steering effort via an actuator, a hydraulic cylinder that is part of a servo system. The valve allows fluid to flow to the cylinder which provides steering assistance; the greater the "twist" of the torsion bar, the greater the force. A double-acting hydraulic cylinder applies a force to the steering gear, which in turn steers the roadwheels. Davis moved to General Motors and refined the hydraulic-assisted power steering system, but the automaker calculated it would be too expensive to produce. General Motors introduced the 1952 Cadillac with a power steering system using the work Davis had done for the company almost twenty years earlier. Each vehicle owner's manual gives instructions for inspection of fluid levels and regular maintenance of the power steering system. However, the equipment in use was old and suffered from deferred maintenance. Electric power steering systems use electric motors to provide the assistance instead of hydraulic systems. Power steering can also be engineered to provide some artificial feedback of forces acting on the steered wheels. Shock absorbers slow down and reduce the magnitude of vibratory motions by turning the kinetic energy of suspension movement into heat energy that can be dissipated through hydraulic fluid.