Lane,
There is much hidden in the details of the Public Works Plan (PWP) presented by Caltrans. They are not just adding four more HOV lanes.
The full width of the freeway will be as much as 16 lanes wide. The 8+4 alternative is veiled language. In addition to the 8 travel lanes and the four carpool lanes there will be one or two auxiliary lanes on each side (Section 4.2.3 Page 4-11). Caltrans does not include these in the press releases. The bridge widths (Table 4-4, Page 4-13) at various lagoons are almost a football field wide or more give an indication of what can be expected at the surface street crossings: San Elijo Lagoon (303-388 ft), Batiquitos (254 ft + 19.2ft gap), Agua Hedionda (269 ft.), Buena Vista (310 ft.).
The scale of this freeway will have a adverse impact on the ability of bicyclists and pedestrians to negotiate the interchanges. The freeway interchange here is Solana Beach has created a barrier for the residents who choose to walk or bike across the great divide. Most adults are hesitant to walk or bike through it, and most will not allow their children to even attempt to cross it.
Our neighbors to the north will face even greater obstacles. Look at the extra lanes required for the ramp and interchange improvements in Table 4-6, page 4-17 (source: http://www.dot.ca.gov/dist11/Env_docs/I-5PWP/5PWPDraft.html). For example, the Santa Fe Drive on ramp to northbound I-5 currently is 1 lane. This will increase to 3 lanes after construction. Each lane is 12 feet wide, which means a bicyclist/ped will have to cover an additional 24 feet just on that one on-ramp. There is no comment on whether additional capacity will be added to the off ramp. Having multiple turn lanes to the freeway on ramps is a major conflict area for cyclists as evidenced by the design of the various interchanges on the I-15 corridor. These interchanges are going to be a huge barrier to pedestrians and bicyclists.
BikeWalkSolana, Bike Walk Encinitas and the Oceanside Bicycle and Pedestrian Committee met with Caltrans a few weeks ago. This was our second meeting about the PWP. Caltrans is pitching this to the Coastal Commission with part of the intent that it will provide better access to our coast: "Enhancing public access to coastal and recreational areas in the corridor is a high priority of the NCC Program" (source: http://www.keepsandiegomoving.com/Libraries/Transnet-doc/SAN_I5_FS_PWP_TREP_022813_FINAL.sflb.ashx). In this light the PWP considers bicycling and walking to be for the most part recreational activities. While they do make much of adding missing east-west bike/ped connections those connections will be difficult for the most competent to make. Bike/ped transportation issues need to be considered on an equal footing with vehicle traffic as bike/ped modes offer strong reductions in greenhouse gases, particularly for local trips.
Douglas
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