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  2. File:Skateboard Ramp Plans Steel 4ft with deck.pdf - Wikipedia

    en.wikipedia.org/wiki/File:Skateboard_Ramp_Plans...

    The prototype is for a 4' mini ramp with deck. Each section is 8' wide and has one transition. Four such sections, welded together, would make a 16' wide mini ramp with 10' flat-bottom. The prototype drawing could be modified to make a spine ramp or to add bowl corners. The prototype could also be modified to make a taller mini ramp or vert ramp.

  3. Interstate Highway standards - Wikipedia

    en.wikipedia.org/wiki/Interstate_Highway_standards

    Longer bridges can reduce the width of both shoulders to 4 feet (1.2 m). Existing bridges can remain part of the Interstate system if they have at least 12-foot-wide (3.7 m) lanes with 3.5-foot (1.1 m) shoulder on the left and a 10-foot (3.0 m) shoulder on the right, except that longer bridges can have 3.5 feet (1.1 m) shoulders on both sides.

  4. Curb cut - Wikipedia

    en.wikipedia.org/wiki/Curb_cut

    Accessible curb cuts transition from the low side of a curb to the high side (usually 15 cm or 5.9 in change in level). Accessible curb ramps are a minimum of 1 metre (3.28 ft) wide. They are sloped no greater than 1:12 (8.33%), which means that for every 12 cm (4.7 in) of horizontal distance, they rise no more than one centimetre (3 ⁄ 8 in

  5. Geometric design of roads - Wikipedia

    en.wikipedia.org/wiki/Geometric_design_of_roads

    The geometric design of roads is the ... 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 ...

  6. Cattle grid - Wikipedia

    en.wikipedia.org/wiki/Cattle_grid

    Wider grids are used where wildlife is to be contained. Some animals can jump across them, and a barrier that stops deer needs to be at least 16 feet (5 m) wide. [26] Bison, and bulls in particular can easily jump across an 8-foot (2.4 m) barrier, and have been known to jump widths of up to 14 feet (4.3 m). [29] [30]

  7. Stairs - Wikipedia

    en.wikipedia.org/wiki/Stairs

    Besides the cosmetic appeal, starting steps allow the balusters to form a wider, more stable base for the end of the handrail. Handrails that simply end at a post at the foot of the stairs can be less sturdy, even with a thick post. A double-ended feature tread can be used when both sides of the stairs are open.