devil's slide south portal pedestrian/bicycle crossing report 4-11-2011
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8/6/2019 Devil's Slide South Portal Pedestrian/Bicycle Crossing Report 4-11-2011
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Devil’sSlideSouthPortal
Pedestrian/BicycleCrossingUpdate
MCCReporttoSupervisorDonHorsley
ApprovedbyMidcoastCommunityCouncil-April11,2011
PreparedbyMCCCommiFee:
LenErickson,BillKehoe,NeilMerrileesandSabrinaBrennan(communitymember)
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Drawingshowsthatoriginalcrosswalkhasmovedsouth50feet
andsimplifiesthecrossingtothewestsidetrailandparking
area.
3Devil'sSlide-SouthPortalPedestrian/BicycleCrossing-Report4/11/2011
Original
Crossing
Location
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TheCoastalTrailasproposedwillextendfromGreenalleytrail
entranceontheeastsideofhighwaytotheproposedcrossing
(blueandgreenlinesoneastsideofhighway).
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Proposed
Trail
Connection
to Crossing
Proposed
Trail
Connection
to Crossing
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Sightlinesanddistancetocrossingremainaconcern.
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Proposed Trail
Connection to
Crossing
A car at minimum
allowed distance doesnot have a straight sightline to the intersection.
A car at minimum
allowed distance doesnot have a straight sightline to the intersection.
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OceanviewsonthewestsideofthehighwayacrossfromGreen
alleytrailentrance…
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…willaFractpeopletocrossthehighway.
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Green Valley Trail
Entrance to Highway
1. (Current roadway
to be removed)
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Peopleinthesouthportalparkingarea….
Southern boundary
of south portal
parking area.
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….willalsobeaFractedtomovesouthforviews
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TheSouthPortalcrossingareashouldbeconsidered
toextendfromthetunnelentrance/exit
totheGreenalleytrailentrancetohighway1.
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Green Valley Trail
Entrance to Highway
1. (Current roadway
to be removed)
Tunnel Entrance/Exit
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AnextendedatgradecrossingareasuchasusedonHighway1in
Davenport,northofSantaCruz,isnotsafeforthisarea
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March16,2011
SecondMCCCommiFee–CaltransMeeVng
Caltransprovidedaboveandbelowgradecrossing
designconceptsforthisarea
Caltransisconcernedthatprovidingaformalatgrade
crossingintheGreenalleyareawouldincurliability.
Caltransdoesnotsupportundergradecrossings.
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ConceptAlternaVve1–OverCrossing
Proposed Crossing
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ConceptAlternaVve2–OverCrossing
Proposed Crossing
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ConceptAlternaVve3–UnderCrossing
Proposed Crossing
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Devil’sSlideTunnel–SouthPortal
Pedestrian/BicycleCrossingLocaVons
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2003 - 2007
Crossing design with traffic
signal capability but not installedat tunnel opening
2011 – Crossing with
enhanced pedestrian
crossing technology.
2011 – PreliminaryConcept studies linking
to Green Valley TrailHighway 1 entry with
designs for over /under
crossing.
~ 480 feet
N
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Southfacingviewof
GreenalleyTrailentrancetohighway.
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Green Valley Trail
Entrance to Highway 1.
(Current maintenanceroadway to be removed)
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NorthfacingviewGreenalleyTrail
entrancetohighway.
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Green Valley Trail Entrance
to Highway 1. (Current
maintenance roadway to beremoved)
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SummaryGoal:ProvideforasafePedestrian/BicycleCrossing
oftheCaliforniaCoastalTrailattheDevil’sSlideSouthPortal
• ThemostrecentCaltransdrawingforanat-gradecrossingisanimprovementoverearlierdesigns,butremainsanunsafe
crossing.
• TheplantokeeptheCoastalTrailontheeastsideofHighway1fromGreenalleytothecurrentproposedatgradecrossingis
notrealisVc.
• ThepublicwillusethewestsideofthehighwaywhichisthemorescenicopVontoconnecttotheproposedDevil’sSlidetrail
area.
• ThevicinityoftheGreenalleyTrailentranceisthebestcrossingarea.
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Summary(Con?nued)
• Caltranshasprovidedpreliminarycrossingdesigns,butthereareissuesassociatedwiththisopVonwhichimpactcostand
schedule.
• Thenorthboundbusstopshouldbemovedtothisarea.
• ResponsibleagenciesshouldevaluatethisopVonandprovidedetailedplansforacrossing.
• ImplemenVngthisplanshouldbeahighpriority.
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DetailSlides
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Overview
The current design for the Devil’s Slide south portal includes:
• Parking for motor vehicles
• View areas• Access to the California Coastal Trail segment created from the
abandoned section of Devil’s Slide Highway 1
This area is accessed by motor vehicles with left and right turns to enter and
exit the area from north and south bound Highway 1. Pedestrians andbicycles who are on the east side of Highway 1 will use a crosswalk at the
same intersection used by motor vehicles. Buses that do not enter the
parking area will have bus stops to the side of the north and south bound
lanes.
The safety of the pedestrian / bicycle crossing is an identified concern of theMidcoast Community Council. A committee was formed to study this matter
further, including meetings with Caltrans. This is the report of the committee
to the MCC.
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Background–Priorto2011(urtherdetailsinfollowingslides)
• 2003–ReportbyDevil’sSlideTunnelsAestheVcsCommiFee – TwoopVonsforcrossing(27mand130mfromtunnel) – Signalcrossingat130mopVonadopted
• 2005–StudyofAssessmentofDevil’sSlideTrailUse – Providesassessmentofinterestinusebasedonopinionsurvey – Cites2005PublicreportindicaVngsignalsatcrossingeliminated
• 2007–Devil’sSlideCoastalAccessMeeVng–Jan.11,2007 – Lackofsignalrequirementattunnelopeningconfirmedbutsignalinfrastructurewillbeinstalledandretainedinplace
– ReportbasedonassessmentbycountyandstateparksofMidcoasttrafficpaFernsinothersimilarareas
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CommiFeeAcVvityin2011
• LeFersofConcern – SupervisorDonHorsley – MidcoastCommunityCouncil
• SafeTunnelPortalPedestrianCrossing-MCCCommiFee – Mar.2,2011:MeeVngwithCaltrans(AtofficeofSenatorLelandYee)
• Enhancedtechnologyforpedestrian/bikecrossingproposed(flashingwarninglightsandin-roadwaylighVng)
• Trafficsignalinfrastructureretainedforleturnsifneeded – Mar.16,2011:MeeVngwithCaltrans(AtCaltransinOaklandwithrepresentaVvesofJerryHillandJackieSpeieraFending)
• Early,conceptualplansforunderandovercrossingalternaVves• Note:Preliminaryplans-notadetailedstudy• Note:Under-crossingsnotsupportedbyconsideredappropriateperBijanSarVpi(District4Director)
• ConsiderscrossinglocaVonatGreenalleyTrailentrytoHighway1
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From
"Devil’s Slide Tunnels Project Aesthetics Committee Report, Phase II" 2003
Chuck Kozak and April Vargas of the MCC representing the community
http://www.dot.ca.gov/dist4/dslide/docs/dst2ac_final031203.pdf
3.5.2. Southern Access Roads to Future Trails
The southern access road to future trails will serve as a drop-off point for visitor access to the trail. Caltransprovided two design alternatives for this access road and cul-de-sac. The first alternative provided for a road
located 27-meters south of the tunnel entrance. Vehicles traveling northbound would use the signalized intersectionfor egress and ingress. The committee did not accept the proposal because of inadequate site distance betweenthe exit of the tunnel portal and the entrance of the access road.
The second alternative relocated the entrance to the access road 130-meters south of the tunnel entrance to meet
the Caltrans standard stopping sight distance requirement for a forty-five mile per hour design speed. Thecommittee accepted this second proposal. Refer to Appendix H. No parking will be available in this area exceptfor designated handicap parking. At this intersection, Caltrans will install signal lights to provide safe left turn
movements into the cul-de-sac area and future pedestrian crossing.
South Portal Crossing Note: (email from Chuck Kozak) The committee agreed that the design decisions should not preclude possible trail alignments and connections at the portals, including possible trail connections throughGreen Valley from the Grey Whale Cove Parking lot and McNee Ranch State Park, and the utilization of the Half
Moon Bay-Colma Road roadbed that runs above the south portal area.
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From
“Assessment of Likely Use and Impacts from Proposed Devil’s
Slide Trail”
Study for California Coastal Conservancy – 2005Pat Tierney – SF State
Full Report
Conclusions excerpts (p.33-35)
Area residents, visitors and all park managers viewed the new Devil’s Slide Trail
(DST) as a tremendous chance to expand public recreation opportunities. Themajority of survey respondents and nearby park managers indicated the trail will
become a heavily used recreation attraction. It is not unreasonable to expect DST
use to fall between 50,000 to 100,000 person-visits during the first full year it isopen. The level of use could double in five years after opening.
Plans by Caltrans for the tunnel portal areas, as shown in the May 2005 Devil’s Slide
Final Public Access Implementation Plan, include parking spaces at portals (17 northand 27 south), bus pads, a number of traffic signs, an interpretive sign and trashreceptacles. Caltrans initially proposed pedestrian traffic signals at the access
road for both north and south portals to allow safe crossing of Highway 1, buthas since eliminated signals. Survey results from visitors and park managers
strongly suggest more facilities than those proposed by Caltrans will be required or are highly desired.
South Portal Crossing Note: (Phone call with Pat Tierney) This study is an opinionsurvey that included the option of free shuttle service. It was not intended to provide
an operational model for assigning use to north versus south portals or how peopleaccessed the portals (car, free shuttle, SamTrans bus, bike, walk).
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GrayWhaleCoveSupplementNote
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GrayWhaleCove-Greenalley–SouthPortalThisisthefullrecreaVonareathepublicwillusewiththeGreenalley
trailprovidingacriVcalCoastalTraillinkandtheGrayWhaleParking
areaprovidingonlylargepublicparkingfacilityforthisarea.
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Pedestrian Trail from
south, coming out of
Green Valley
Gray Whale Cove:
substantial parking and
unmarked crossing to accessthe beach.
San Mateo County and
the Coastal Conservancy
need to agree on a trailplan.
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Stairstohighwaynearentrance
toGreenalley.
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Highway1northboundentryto
GrayWhaleCoveStateParkcrossingarea
representsanotherHighway1crossingproblem.
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