Here is the news release from Metro:

Major construction will begin Friday, May 2 on Metro Crenshaw/LAX Transit Project starting with work on the underground stations on Crenshaw and Martin Luther King Jr. boulevards with a full street closure to implement a new traffic configuration.

Walsh/Shea Corridor Contractors (WSCC) will implement the new traffic configuration between Martin Luther King Jr. Boulevard and Stocker Street beginning at 10 p.m. on Friday, May 2, through 1 p.m. Saturday, May 3.

WSCC will place Crenshaw Boulevard k-rail (concrete barriers) on the eastside to separate the work area from the street traffic and re-stripe traffic lanes. Work is anticipated to last for 15 hours and will be done in two phases.

Phase 1

Southbound detour

Phase one will be from 10 p.m. Friday until 2 a.m. Saturday, diverting traffic between Jefferson Boulevard to Vernon Avenue. Motorists traveling southbound on Crenshaw Boulevard will be detoured left on Jefferson, right at Arlington, right at Vernon and left and back on to Crenshaw.

Phase 2

Northbound detour

Phase two will begin at 2 a.m. Saturday until 1 p.m. diverting traffic between Martin Luther King Jr. Boulevard and Stocker Street. Motorists traveling northbound on Crenshaw Boulevard will be detoured left on Stocker Street, right on Santa Rosalia Drive, right on Marlton Avenue, left on Martin Luther King Jr. Boulevard and left on to Crenshaw Boulevard.

After the full street closure on Saturday, traffic will resume with two lanes in each direction. The bus stop located on the eastside of Crenshaw Boulevard will be temporarily relocated to the southeast corner of the intersection of Crenshaw Boulevard and Stocker Street.

There will be limited access to businesses during the night time activity, however, pedestrian access will be maintained as well as access to emergency vehicles.

The 8.5-mile Crenshaw/LAX Transit Corridor Project is a light-rail line that will connect the Expo and Green Lines. The $2.058 billion Measure R transit project will serve the Crenshaw Corridor, Inglewood, Westchester and the LAX area with eight new stations, a maintenance facility, park-ride lots, traction power substations and the acquisition of rail vehicles and maintenance equipment.

Following the closure WSCC will begin these construction activities: utility relocation, pile installation, street decking and excavation.

Construction of the underground stations is anticipated to last four years. However, the construction work will be done underground. Traffic lanes will be reconfigured but traffic will be maintained during the four years of construction.