When lane direction control signals are placed over the individual lanes of a street or highway, vehicular traffic may travel in any lane over which a specified or appropriate green indication is shown but shall not enter or travel in any lane over which a specified or appropriate red indication is shown. When such signals are in use, signs adequate to advise motorists of the meaning of such signals shall be erected.
Neb. Rev. Stat. § 60-6,126
R.S.1943, (1988), § 39-617;
Laws 1993, LB 370, § 222.