In February 2013, construction began on the northern HOV lanes; the project is expected to cost $86 million. By May, construction on the Palomar Street direct access ramps had begun, and the Carroll Canyon Road ramps were almost finished. The northern project was completed in 2015, and the southern express lanes opened in March 2014 at a cost of $1.4 billion, with an option to expand them into two lanes in each direction, and a proposed direct ramp to the express lanes. A 2012 Caltrans report proposed adding four managed lanes along the entire length of the highway. Construction on HOV lanes from SR 905 to SR 15 began in 2016.