SR 20 in Nevada County remains closed in both directions between SR 49 and Rough and Ready Hwy. due to a major head-on collision involving two big rigs. Alternate routes include Rough and Ready Hwy. or McCourtney Rd. to Indian Springs Rd. ETO later tonight @CHPgv@NevadaCountyCAhttps://t.co/5vEeDaWYLJ