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  2. Concrete leveling - Wikipedia

    en.wikipedia.org/wiki/Concrete_leveling

    In civil engineering, concrete leveling is a procedure that attempts to correct an uneven concrete surface by altering the foundation that the surface sits upon. It is a cheaper alternative to having replacement concrete poured and is commonly performed at small businesses and private homes as well as at factories, warehouses, airports and on roads, highways and other infrastructure.

  3. Permeable paving - Wikipedia

    en.wikipedia.org/wiki/Permeable_paving

    Permeable paving systems, especially those with porous surfaces, require maintenance in order to keep the pores clear of fine aggregates as to not hinder the systems ability to infiltrate stormwater. The frequency of cleaning is again dependent on many site specific factors, such as runoff volume, neighboring sites and climate.

  4. Self-levelling suspension - Wikipedia

    en.wikipedia.org/wiki/Self-levelling_suspension

    Many vehicle systems on a conventional vehicle are negatively affected by the change in attitude coming from changes in load - specifically a heavy load in the rear seat or luggage compartment. [1] This change in attitude affects aerodynamic properties, headlight aim , braking , bumpers, shock absorption from the suspension and the vehicle's ...