pages: TransportationCommission/2007-07-25.pdf, 3
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TransportationCommission | 2007-07-25 | 3 | Art Dao, Deputy Director, ACTIA, provided an update on the development of the Broadway/Jackson/I-880 access improvement projects. He noted that the existing funds will not be enough to deliver this project, and that state and federal financial assistance would be necessary. Their goal is to use the PSR as the platform to compete for that funding. Dave Dickinson, consultant project manager, described and discussed the feasibility study. He noted that there were some issues with ground water with respect to constructing the exit from the Posey Tube. He noted that the curve of a proposed ramp coming out of the Tube could only accommodate design speeds of 23 mph, so they were looking at different options to reduce the speeds in the Tube and enhance safety. With respect to the proposed I-980 ramps, he believed they could provide some benefit. However, he noted that the merge distance between consecutive on- and off-ramps was much less than half of standard. In addition, the ramps violate FHWA policy regarding placing new local ramps on the freeway-to-freeway connector such as this stretch of I- 980. They also explored whether the Broadway off-ramp could touch down at Webster or Harrison, so that Alameda-bound traffic could turn smoothly into the Webster Tube. The feasibility alternative examined touching down at Harrison; however, it introduced another intersection at Harrison and Sixth. They were examining whether it could be brought all the way down to Webster, depressing Harrison about five feet in order to get a reconstructed off-ramp at Harrison. They also examined whether the I-980 off-ramp could be dropped directly into the Webster Tube, but it was determined not to be feasible due to the profile grades and trying to get three lanes of traffic into two lanes. Mr. Dickinson noted that they wanted to finalize the geometric analysis, and to understand the origin/destination studies. He displayed the areas where traffic counts were also being performed, and believed this data would provide a credible traffic forecasting and operations analysis for this project. Commissioner Krueger inquired whether the context-sensitive alterations near the senior center in Chinatown could be seen as a short-term issue, or as an alternative to the reconfiguration of the ramps for the sharp right turn out of the tube. Mr. Dickinson replied that they were exploring that issue, and suggested that it may be both. He noted that it seemed to have promise as a long-term viable solution, and if the pedestrian conflicts could be removed, that ramp may become an in effect dedicated freeway on- ramp. He noted that it was signed and striped for that function. Chair Knox White noted that the staff report stated that Oakland had recommended the elimination of Alternative B-1, and inquired whether those issues had been resolved in order to allow that alternative to move forward. Mr. Dickinson replied that Oakland had partnered with them, and that he had not heard anything to indicate that they might turn down Alternative B-1, although some elements may need to be addressed. They continued to move forward in exploring B-1, and had not been told to stop. Transportation Commission July 25, 2007 Page 3 of 10 | TransportationCommission/2007-07-25.pdf |