Improvement of Functional Designation of Low-Volume Roads by Dust Abatement in Lithuania

Gravel pavement prevails in Lithuanian state roads of regional significance, which make up 69% of the total road network. Dustiness of gravel roads reduces visibility and hinders traffic safety. Natural gravel from deposits, the particle size distribution of which ranges widely, is used in most gravel pavement. The variation of the particle size distribution is typical of all gravel deposits of melting glacial waters and those of river genetic origin in Lithuania. Gravel deposits contain a small quantity of fine particles, and the quantity of large particles is sufficient. However, gravel becomes finer because of pavement wear, and the quantity of particles larger than 5 or 4 mm according to standard sieves reduces to between 24.6% and 37%. Fine particle content (fraction