The Manual on Uniform Traffic Control Devices (MUTCD) is approved by the Federal Highway Administrator. as the National Standard in accordance with Title 23 U.S. Code, Sections 109(d), 114(a), 217, 315, and 402(a), 23 CFR 655, and 49 CFR 1.48(b)(8), 1.48(b)(33), and 1.48(c)(2).
The dominant vegetation types are grassy prairie and grass steppe in which numerous species of the grass genus Stipa are particularly conspicuous. Pampas grass (Cortaderia selloana) is an iconic species of the Pampas. Vegetation typically includes perennial grasses and herbs.
Trees are rare in the Pampas, and frequent wildfires allow only various kinds of grasses to flourish. These are mostly prairie and steppe type grasses. âPampas grassâ is the distinct species of the region. These grasses grow in various strata because water is available in gradients. The soil is comprised chiefly of clay, fine sand and silt washed towards the Atlantic by the great rivers; they are also blown to the region by dust storms from the west.