Click for next page ( 29

The National Academies | 500 Fifth St. N.W. | Washington, D.C. 20001
Copyright © National Academy of Sciences. All rights reserved.
Terms of Use and Privacy Statement

Below are the first 10 and last 10 pages of uncorrected machine-read text (when available) of this chapter, followed by the top 30 algorithmically extracted key phrases from the chapter as a whole.
Intended to provide our own search engines and external engines with highly rich, chapter-representative searchable text on the opening pages of each chapter. Because it is UNCORRECTED material, please consider the following text as a useful but insufficient proxy for the authoritative book pages.

Do not use for reproduction, copying, pasting, or reading; exclusively for search engines.

OCR for page 28
28 ing checklist was developed to facilitate enforcement, which and eastward to I-95. This corridor was determined to be the appears to have paid off. There have been no further reports most promising BBS project. Buses operating on this corridor of unauthorized vehicles using the shoulder or buses going would need to be fitted with transponders to use the express faster than 25 mph. "sun pass" toll lanes. The BBS lanes would be continuous over the length of the corridor in both directions of travel. Initial implementation is anticipated for May or June 2006. CHECKLIST PROVISIONS FOR USE OF WIDENED EMERGENCY I-75/SR-826 Corridor SHOULDER EASTBOUND DULLES AIRPORT CONNECTOR ROAD This BBS project would run between NW 186th Street (Miami Who can use widened shoulder: Buses going to the West Falls Gardens Drive) and the Miramar Parkway. The distance is ap- Church Metro Station. proximately 15 mi and the segment has about 10 interchanges Location: Widened shoulder along eastbound Dulles Airport Con- (with an average distance between interchanges of 1.5 mi). nector Road, from east of the Magarity Road overpass to the ramp leading to the West Falls Church Metro Station (a distance of ap- BBS shoulders would operate in both directions of travel when proximately 1.3 miles). speeds drop to 35 mph or less. BBS would be easy to imple- Days, Times, Conditions: Monday through Friday, during the ment in this corridor because shoulders are suitably designed. hours posted on the signs installed along the shoulder,* only when mainline speeds are less than 25 miles per hour. BBS signage would be the primary improvement required. (* Note: As of 10/25/01 posted hours of operation are 48 p.m.) Speed Limit on the shoulder is 25 miles per hour. Primary Use of Shoulder is for disabled, emergency, and police SR-826 Corridor vehicles. Periodic use of shoulder by buses to bypass congestion is secondary to its primary use. Safety First. Buses must have their headlights turned on when us- The SR-826 (Palmetto Expressway) BBS would extend from ing the shoulder. Bus drivers must use extra care and keep a sharp SR-94 (Kendall Drive) to NW 67th Street (near I-75), a dis- lookout for disabled or stopped vehicles on the shoulder, and for tance of 16 mi. The Palmetto Expressway BBS segment has situations which may require vehicles responding to an emergency to use the shoulder. Dispatchers will inform bus drivers whenever about 15 interchanges, which translates to an average of 1.1 the dispatchers are notified of such a situation. If the shoulder is mi between interchanges. BBS shoulders would be provided occupied by a stopped vehicle, bus drivers shall not use the shoul- for both directions of travel. der west (upstream) of stopped vehicle. Shoulder Conditions. Buses may not use the shoulder when snow accumulation has narrowed its available width. I-95 Corridor Feedback has been positive; "riders are thrilled at bus schedule reliability." A BBS project between I-195 and I-395 is proposed to fill a gap in the regional transit priority network. The distance of this BBS segment would be approximately 1.6 mi. Shoulders would CASE STUDY 3--MIAMI, FLORIDA be provided for authorized buses in both directions of travel. The MiamiDade MPO is developing BBS projects for sev- eral major corridors. This BBS planning involved the Florida SR-874 Corridor DOT, MiamiDade Expressway Authority, MiamiDade Transit, and the Turnpike Authority. The recommended BBS The BBS project would extend from SR-990 (Killian Parkway) projects include: on SR-874 (Don Shula Expressway) to US-1 South Dixie Highway on SR-878 (Snapper Creek Expressway). The SR-874 BBS distance would be approximately 2.6 mi. SR-821/SR-836 Corridor I-75/SR-826 Corridor SR-826 Corridor The MPO completed a planning study for these BBS proj- I-95 Corridor ects in August 2005. The planning study addressed adequacy SR-874 Corridor. of the shoulders, level of emergency vehicle response service using the shoulders, and transit services. Key features of the plan are: SR-821/SR-836 Corridor Shoulder features--Minimum 10 ft wide, and 12 ft SR-821 is a portion of the Florida Turnpike, and the BBS seg- wide where truck volumes exceed 250 vehicles per ment in southwest Miami is sometimes referred to as the hour. Cross slopes of 2% to 6%. Color or texture of Homestead Extension of the Florida Turnpike. SR-836 is pavement to distinguish between traffic lanes. commonly called the Dolphin Expressway. The SR-821/SR- Usage rules--When speeds drop below 35 mph. Only 836 BBS project is an 18-mi-long facility with more than a authorized buses would be permitted and signage dozen interchanges (with an average of 1.4 mi between inter- would be similar to that used in Minneapolis. This changes). The BBS project would extend from SW 88th would include the on-ramp warning signs; "Watch for Street (near Bird Road) on the Florida Turnpike to SR-836 Buses on Shoulder."