(2.) It must be durable and require the least possible amount of repairs at the least cost.
(3.) It must be safe, firm and hard, with an even face and yet giving sufficient foothold to horses.
(4.) It must be as noiseless as possible.
(5.) It must be so constructed as to be quickly laid down and repaired when broken up for water, gas, drains, or other purposes.
(6.) It must be of strong foundation, so as to carry the heaviest weight without subsidence.
(7.) It must be of such a shape as will throw off all surface water at once.
(8.) It must be of such materials as will make a minimum of dust or mud.
(9.) It must be easily cleansed.
(10.) It must be non-absorbent of impurities or moisture of any kind.
(11.) It must give easy traction upon its surface.