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Therefore, Exhibit isused for all three scenarios. Plan for outside lane and shoulder closure for part-widthconstruction on a four-lane divided highway. The scenario isdifferent from the one in Section 5.

Possible vehicle encroachments from the opposite traveledway i. There is an assumed 0. The segment analyzed is approximately 4. For the no-barrier work zone alternative, the right edgeof the right travel lane was 0. For the barrier alternative, the edge ofthe barrier was placed 0. Therefore, to maintain two3. Exhibits and illustrate a plan and cross sections,respectively, for the outside shoulder closure.

The resultsare illustrated in Exhibit This scenario is different from those in Sections 5. For the no-barrier work zone alternative, the left edgeof the inside travel lane was 0. Cross sections for outside lane and shoulder closure for part-width construction on a four-lane divided highway. Barrier guidelines for 1 outside lane and shoulder closure for part-width construction, 2 outside shoulder closure with minor encroachment, or 3 median shoulderclosure with minor encroachment on a four-lane divided highway.

Plan for outside shoulder closure on a four-lane dividedhighway with minor encroachment. Cross sections for outside shoulder closure on a four-lane dividedhighway with minor encroachment. It is assumed that thebridge crosses a drop-off that is 90 m [ ft] wide and 8. Other roadside hazards include con-struction equipment and workers.

Travel in both directionsis considered. For the base condition, no additional barrieris installed to shield the blunt ends or worker and equip-ment areas, or to stop encroachments that may reach thedrop-off.

In Alternative 1, a guardrail starting at each bluntExhibit Plan for median shoulder closure on a four-lane divided highway withminor encroachment. The multiple purposes ofthe guardrail are to 1 shield the barrier blunt end by pro-viding a guardrail-concrete barrier transition see the Road-side Design Guide Section 7.

For Alternative 2,the same length of guardrail is provided, but only on theupstream barrier blunt ends for each direction of travel. Exhibits and illustrate a plan and cross sections,respectively, of the bridge reconstruction with a temporarydiversion. The results are illustrated in Exhi-bits and This scenario involvesa substantial decrease in the separation of opposing trafficon higher-volume facilities, and an important design deci-sion is whether to provide a temporary concrete barrierbetween the opposing directions of travel.

Section 6G. Theuse of markings and complementary signing, by themselves, shallnot be used. A discussion of this strategy, along with an example planand cross sections, can be found in Section 4. State practice varies. Some states always provide a tempo-rary barrier between opposing directions of travel. Otherstates provide a barrier depending on the length of the two-lane, two-way segment. Important factors in the decisionshould include anticipated operating speed, volume, and thepresence of restrictive cross-sectional conditions.

The guidelines from their analy-sis are shown in Exhibit Regions to the right of thethree line types represent benefit-cost ratios greater than orequal to 1. Cross sections for median shoulder closure on a four-lane divided highway withminor encroachment. Exhibits and illustrate a plan and cross sections, respectively, forthis condition. RSAP was used to analyze the decision to shieldthis blunt end with a guardrail.

The guardrail starts at the bluntend, runs The purposes of theguardrail are 1 to protect the barrier blunt end by providinga guardrail-concrete barrier transition see the Roadside DesignGuide, Section 7. Exhibits and illustrate a plan and cross sec-tions, respectively, for this condition. It is extremely likely that you currently possess at least one device with a working Internet connection, which means that you have access to numerous online libraries and catalogs.

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