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  2. Turning radius - Wikipedia

    en.wikipedia.org/wiki/Turning_radius

    Diagram showing the path of a driver performing a U-turn.A vehicle with a smaller turning diameter will be able to perform a sharper U-turn. The turning radius (alternatively, turning diameter or turning circle) of a vehicle defines the minimum dimension (typically the radius or diameter, respectively) of available space required for that vehicle to make a semi-circular U-turn without skidding.

  3. Wheel sizing - Wikipedia

    en.wikipedia.org/wiki/Wheel_sizing

    The wheel size is the size designation of a wheel given by its diameter, width, and offset. The diameter of the wheel is the diameter of the cylindrical surface on which the tire bead rides. The width is the inside distance between the bead seat faces. The offset is the distance from the wheel's true centerline (half the width) to the wheel's ...

  4. Geometric design of roads - Wikipedia

    en.wikipedia.org/wiki/Geometric_design_of_roads

    The selection of lane width affects the safety, maximum capacity, and cost, of a highway. Safety is best at a width of 3.0 to 3.1 metres (9.8 to 10.2 ft) in urban settings, where both narrow (less than 2.8 metres (9 ft 2 in)) and wide (over 3.1 metres (10 ft)) lanes have higher crash risks.

  5. Roundabout - Wikipedia

    en.wikipedia.org/wiki/Roundabout

    A roundabout, a rotary and a traffic circle are types of circular intersection or junction in which road traffic is permitted to flow in one direction around a central island, and priority is typically given to traffic already in the junction. [1][2] In the USA, engineers use the term modern roundabout to refer to junctions installed after 1960 ...

  6. Jersey barrier - Wikipedia

    en.wikipedia.org/wiki/Jersey_barrier

    A Jersey barrier, Jersey wall, or Jersey bump is a modular concrete or plastic barrier employed to separate lanes of traffic. It is designed to minimize vehicle damage in cases of incidental contact while still preventing vehicle crossovers resulting in a likely head-on collision. Jersey barriers are also used to reroute traffic and protect ...

  7. Types of road - Wikipedia

    en.wikipedia.org/wiki/Types_of_road

    Farm to Market Road. Parkway. Beltway. Reversible lane. Trunk road. Turnpike. Autostrada A1 in Italy. Expressways (Limited-access roads and grade-separated highways) Autobahn.

  8. Z scale - Wikipedia

    en.wikipedia.org/wiki/Z_scale

    Z scale is one of the smallest commercially available model railway scales (1:220), with a track gauge of 6.5 mm / 0.256 in.Introduced by Märklin in 1972, Z scale trains operate on 0–10 volts DC and offer the same operating characteristics as all other two-rail, direct-current, analog model railways.

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