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the engineers recommended that Contra Costa County install "rumble strips" from Walnut
Boulevard to the Alameda county line. These are roughened strips of asphalt placed down the center line and the sides of each lane, intended to alert drivers when they stray off the road or into the oncoming traffic lane. This alternative was implemented by the county, along with adding "Do Not Pass" and "Passing Lane Ahead" signs at appropriate places.
189:, a 12.8-mile (20.6 km) segment of Vasco was relocated and widened to accommodate increased traffic and heavy trucks. The old roadway was submerged by the reservoir. When the road re-opened, it carried about 16,000 vehicles per day. In 2009, Vasco Road was extended northwestward from Walnut Street to Marsh Creek Road, where it joined the third segment of John Marsh Heritage Highway (California State Route 4 Bypass, now part of
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The engineering firm that performed the safety report considered the feasibility of installing a concrete barrier down the center median. This proposal was rejected because of the high cost, as well as objections by some county agencies about lack of adequate access to emergencies. As an alternative,
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As originally constructed, Vasco Road was unprepared to meet the demands of high-volume traffic. Blind curves, narrow lanes, steep hills and inadequate shoulders all contributed to the increasing number of accidents. Some of these issues remained even after the relocation and reconstruction of much
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signed SB 3 into law, establishing a "double fine" section on Vasco Road from Walnut
Boulevard in Brentwood to Interstate 580 in Livermore. The law doubled the fines for "unlawful passing and overtaking, excessive speed, reckless driving, drunken driving and other serious moving violations" until
171:) and wound over the Diablo Range and through the Kellogg Creek valley. In 1957, Alameda County linked three other streets inside Livermore to extend Vasco to Tesla Road. A ribbon-cutting ceremony opened the new Vasco Road on August 1, 1958.
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Contra Costa County began a project in 2010 to install a median barrier along a one-mile stretch of the road. This also required widening the roadway and a bridge, building retaining walls, and extending a passing lane.
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The traffic count in 2008 was estimated at more than 25,000 vehicles per day. Weekend traffic is also heavy in spring and summer, when residents from other parts of
California flock to the recreation areas along the
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areas began moving into the relatively undeveloped East County area of Contra Costa County. By the early 1990s, traffic congestion on Vasco Road had become severe and accidents were frequent.
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of the road. Many of these accidents were fatal, head-on collisions. A 2004 engineering study reported that there had been 254 collisions between May 1996 through August 2003.
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559:. Wildlife and animal refuge part of the park is open for the public. Co-located Native American archeological site with wall paintings is not accessible to the public.
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193:). In 2010, a section of the road in Alameda County was relocated and widened, eliminating a steep narrow section with several switchbacks.
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139:. Although it is not part of the California State Highway system, it is the principal north–south commuter route serving eastern
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Livermore
Heritage Guild Newsletter September/October 1988. "70 Birthday Candles for Altamont Pass Highway, 50 for Vasco Road."
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Hallisy, Erin. "Safer Road to Open in East Bay / Brentwood-Livermore route to change because of reservoir." April 15, 1996.
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counties. The two counties are each responsible for maintaining the portion of the road within their boundaries.
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Booming population growth caused a sharp increase in housing prices throughout the Bay Area. People working in
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629:"The Dilemma of Vasco Road," Traffic Safety Center on-line newsletter, volume 2, number 2, Spring-Summer 2004.
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Shields, Brian. "Contra Costa County Breaks Ground on Vasco Road
Repairs." Kron4.com. May 24, 2010.
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Jan. 1, 2010. However, road signs declaring the double fine zone were still up as of June 2016.
654:"Contra Costa County Vasco Road Safety Recommendations Summary Report" Updated April 14, 2004."
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Originally, Vasco Road was a two-lane, very narrow road that began at
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641:"State Route 4 Bypass Authority Project Information Web site
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and the
Livermore Area Recreation and Park District (LARPD).
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1.000 mi = 1.609 km; 1.000 km = 0.621 mi
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185:In 1996, concurrently with the construction of
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712:East Bay Regional Parks - Vasco Caves Site
690:East Bay Regional Parks - Brushy Peak Site
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743:Template:Attached KML/Vasco Road
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458:Continuation beyond Vasco Road
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570:Vasco Caves Regional Preserve
534:Brushy Peak Regional Preserve
342:Grade-separated interchange
309:Grade-separated interchange
49:17.7 mi (28.5 km)
19:For the train station, see
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191:California State Route 4
666:San Francisco Chronicle
528:Altamont Pass Wind Farm
503:converting this section
425:North end of Vasco Road
276:South end of Vasco Road
550:Los Vaqueros Reservoir
187:Los Vaqueros Reservoir
127:is a roadway over the
65: / Tesla Road in
780:Livermore, California
775:Brentwood, California
555:Vasco Caves, part of
361:Camino Diablo –
211:Arnold Schwarzenegger
137:Brentwood, California
597:, September 12, 2008
165:U.S. Highway 50
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222:Major intersections
40:Contra Costa County
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505:, if appropriate.
21:Vasco Road station
16:Road in California
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595:Pleasanton Weekly
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507:Editing help
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348:Contra Costa
336:west –
303:east –
273:(Tesla Road)
241:Destinations
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145:Contra Costa
129:Diablo Range
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115:Inauguration
110:Construction
86:in Livermore
471:Attractions
754:Categories
581:References
180:Tri-Valley
125:Vasco Road
27:Vasco Road
515:July 2016
450:SR 4
417:SR 4
393:Brentwood
379:Brentwood
255:Livermore
133:Livermore
104:Brentwood
100:SR 4
75:junctions
67:Livermore
725:KML file
564:See also
454:Martinez
421:Stockton
305:Stockton
232:Location
178:and the
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338:Oakland
250:Alameda
159:History
141:Alameda
490:is in
229:County
46:Length
496:prose
363:Byron
334:I-580
301:I-580
271:CR J2
244:Notes
167:(now
84:I-580
73:Major
63:CR J2
734:help
730:edit
492:list
433:33.3
430:20.7
400:33.3
397:20.7
387:east
385:SR 4
374:31.5
371:19.6
358:28.0
355:17.4
143:and
135:and
118:1958
383:To
317:5.1
314:3.2
284:4.7
281:2.9
262:0.0
102:in
756::
732:•
647:^
572:—
238:km
235:mi
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259:0
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