Q Mr. Roadshow, how much of the BART extension to San Jose will be above ground versus at ground level versus underground?

Mike Dooley

San Jose

A Most of the 15.4-mile line from the current station in Fremont to east of Highway 101 near Berryessa Road in San Jose will be at ground level.

The Fremont portion to Warm Springs is 5.4 miles. A few hundred yards of the tracks just south of the existing Fremont station tracks will be elevated over Walnut Avenue, one mile will be in a subway under Central Park and a little over four miles will be at ground level to the Santa Clara County line.

For the 10-mile extension to the Berryessa station now under construction, the majority of the alignment is at ground level, with about 2.5 miles going under six different streets. The segment from north of Berryessa Road to south of Mabury Road, about a half-mile, will be elevated.

If BART is extended through downtown San Jose, almost the entire section will run through a tunnel under Santa Clara Street.

Q I have tried to contact BART about this problem, but have seen no remedy. When you are on Highway 4 traveling west, there is a sign stating that the next exit in Pittsburg is for BART. But that exit at Bailey Road has two parts, north and south. The first one will never get you to BART because you exit north of the train station and can't get to it without a U-turn somewhere, if you even realize you are past it. The second one -- the southbound exit -- will take you to BART immediately at the bottom of the ramp.

There is no BART sign at the Bailey Road exits, so it is up to the driver to guess which one to take, and having been instructed to take the next exit, it would be logical to take the first (northbound) exit.

Joyce Gunn

Pittsburg

A BART's sign folks will be taking a look soon and will see what they need to do to clarify directions.

Q Gary, I drive Interstate 580 almost every day from the Castro Valley interchange to Lake Shore Avenue in Oakland. The road is very rough. Is there anything in the works for grinding the concrete surface?

Dave Kappler

San Leandro

A Hmmm. This may be difficult for you to digest. Bill-the-Caltrans-Paving-Man says: "This is a tough one, as this section of 580 is one of our better state highways in Alameda County. There is a (paving) project scheduled for 2016. We will continue to keep an eye on this section of 580 and make any repairs that we can to help improve the ride, but to be honest with you this area is in pretty good condition."

Q There are signs of uneven pavement at the 880/AutoMall overpass. Who is responsible to fix it? It has been there for a while.

Mike Lee

Fremont

A Fremont is responsible for the overcrossing. However, the uneven pavement was created by a Caltrans project on the ramps and the state is scheduled to pave this in a few days.

Q I just hope that they will make I-880 five lanes wide, at least from 101 to Brokaw Road in both directions. Four lanes will do very little to cure the huge congestion there.

Bob Rumsey

Saratoga

A When work ends this summer, the freeway will be four lanes wide from 237 almost to 101. There are no plans for a fifth lane.

Q Do you know what is going on between Crow Canyon Road and Sycamore Valley Road in Danville? All the trees are being removed on both sides of the freeway. ... I recently returned from a trip to find all of the trees along the 680 freeway between Sycamore Valley and Crow Canyon being removed. I find this appalling. The corridor now looks like any freeway anywhere with no character whatsoever remaining, and it's truly an eyesore. What is possessing Caltrans to destroy these trees?

Jim Holien, Gary Kuntz and several more

A Folks, I've written about this before but the questions keep rolling in. The trees are being removed to add auxiliary lanes here. Interstate 680 will be widened about 12 feet in both directions between Sycamore Valley and Crow Canyon in the shoulder area. Look for various lane closures for the next few weeks, Monday through Thursday from 8 p.m. to 5 a.m., and Friday from 8 p.m. to 8 a.m.

The state will replant some trees and landscape the area when the widening ends. For more information, go to www.ccta.net.

Q If they are not going to have toll takers on the Golden Gate Bridge, why keep the tollbooths? Why not just have full-speed overhead readers like they have on freeways and bridges elsewhere in the state?

Mike Aubert

El Cerrito

A The toll plaza will stay, as it is being used to house the all-electronic tolling equipment. But to install overheads signs would likely mean removing the toll plaza and building an overhead gantry, which would be a multimillion-dollar project that bridge officials are not prepared to take on at this time.

Q There's an intersection at Bovet Road and El Camino Real in San Mateo, where there is such a long line of left turners that they do not yield to the right turners (both turning to go south on El Camino). Many of the right-turning people stop and wait, which is annoying. Perhaps they should add a light system with arrows?

Fred

A Caltrans traffic counters will be out in a few weeks and will then decide whether to install a protected left turn for the Bovet Road/17th Avenue approaches to El Camino. Stay tuned.

Follow Gary Richards at twitter.com/mrroadshow, look for him at facebook.com/mr.roadshow or contact him at mrroadshow@mercurynews.com or 408-920-5335.