The work is expected to last until 3:30 p.m. with Scotts Valley Police reporting that motorists should take alternate routes if possible.
Caltrans spokesperson Susana Cruz said the work is regularly-scheduled maintenance that includes grinding and paving. The No. 2 lane is closed while the work is in progress.
Traffic was slowed Tuesday morning on eastbound Mount Hermon Road through Scotts Valley as commuters made their way toward Santa Cruz or onto Highway 17 northbound toward San Jose.