Kirker Pass Road is an interregional route between Central and East Contra Costa County. The roadway is used by commuters and approximately 1,200 trucks each day. The mountainous terrain features a number of sustained grades greater than 8%. With a high volume of passenger cars, the truck traffic along the roadway contributes to significant congestion during peak hours. The addition of truck lanes along the roadway would reduce congestion and improve safety along the roadway.