Motorists navigating through the Sepulveda Pass will have less room to maneuver for the next week as construction work narrows a section of Sepulveda Boulevard next to the San Diego (405) Freeway.

Contractors working on the $1 billion-plus freeway reconstruction and widening effort need to re-grade Sepulveda between Montana and Church avenues.

The work began Monday morning and should last seven days. Sepulveda will lose half its capacity as workers limit it to just one lane in each direction.

And even those remaining two lanes of Sepulveda will be closed to all traffic between 9 p.m. and 6 a.m.

The adjacent 405 Freeway lanes are the nearest detour.

The new Sepulveda Boulevard alignment moves the road to the east, allowing Metro to build a new carpool lane and auxiliary exit lanes on the northbound 405 as nearly all of the 50-year-old freeway is rebuilt.

- City News Service