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From page 18... ... 6 CHAPTER 2: REVIEW OF POLICIES AND GUIDELINES BACKGROUND This chapter summarizes the findings from the review of policies and guidelines used by state and local transportation agencies. It opens with a broad overview of the criteria in the current edition of the MUTCD and summarizes previous and anticipated changes to the sections of interest. Read the entire page →
From page 19... ... 7 A An intersection of a less important road with a main road where application of the normal right-of-way rule would not be expected to provide reasonable compliance with the law; B Read the entire page →
From page 20... ... 8 12-month period, or that five or more such crashes have been reported within a 2-year period. Such crashes include right-angle collisions involving road users on the minor-street approach failing to yield the right-of-way to traffic on the through street or highway. Read the entire page →
From page 21... ... 9 C Minimum volumes: 1. Read the entire page →
From page 22... ... 10 5. At any intersection where a special problem exists, and where an engineering study indicates the problem to be susceptible to correction by the use of the YIELD sign. Read the entire page →
From page 23... ... 11 This language provides a reasonable indication that approximately equal at the minimum value is 200 units on the minor street and 500 units in total volume. This is a ratio of 40% minor street volumes to the total volume. Read the entire page →
From page 24... ... 12 Based upon these considerations, the following suggested change was made and endorsed by the full NCUTCD within item number 2 of the minimum volume criteria: 2. The combined vehicular, pedestrian, and bicycle volume entering the intersection from the minor street approaches (total of both approaches) Read the entire page →
From page 25... ... 13 Table 1. Level of Guidance on Selecting Traffic Control Device for Unsignalized Intersections Available in (Online) Read the entire page →
From page 26... ... 14 500 average daily traffic [ADT] Read the entire page →
From page 27... ... 15 limited available corner sight distance unless there is no practical method of improving the sight distance or reducing the speed limit to satisfy the minimum corner sight distance values. Washington's Design Manual (13) Read the entire page →
From page 28... ... 16 Table 3. Maryland MUTCD Table 2B-1a: Guidelines for Conversion from Stop to Yield Control (10) Read the entire page →
From page 29... ... Approxim Combin ADT 7,500–10 10,000–50 50,000–80 >80,00 Washing Washing considera vehicles, for consi manual n approxim vehicles Washing intersecti in the int control th Table 4. P ate ed Four St ,000 ,000 ,000 0 So Figure 1. Read the entire page →
From page 30... ... 18  Existing condition: Current physical characteristics (e.g., speed and sight distance) and collision history are to be reviewed to identify any problematic movements. Read the entire page →
From page 31... ... roadw volum  Crash inters by a m sever  Alter consi  Mobi consi is to b  Right the m Wisconsi multilane grade TW expressw of the fac increase and there minor-ro at the far cases is n judge the Departm NCHRP expressw Figu ay approac e of the tw history: AW ection crash ulti-way st ity of future natives: Imp dered and ev lity impact: dered in term e performe -turn inclus inor approa n's Facilitie divided hig SC with th ay intersect ility and ev in the percen is an increa adway volum -side interse ot failure to arrival time ent of Trans Report 650 ay intersect re 2. Count hes (stop co o approache SC should es that have op installati crashes from rovement al aluated. Read the entire page →
From page 32... ... 20 OUTREACH TO PRACTITIONERS While some potential methodologies have been documented through large-scale research studies and distributed through national publications, other methodologies may be under consideration and/or experimentation in more localized applications. To try to identify these guidelines, the research team used the following posting on the ITE Online Community on October 23, 2013: Dear Colleagues, NCHRP Project 3-109 is evaluating criteria for selecting the type of control at unsignalized intersections. Read the entire page →
From page 33... ... 21 where vision problems are not able to be so easily corrected, a YIELD sign is appropriate. A representative of Portland noted that he uses NCHRP Report 562 (22) Read the entire page →

From page 18...

... 6 CHAPTER 2: REVIEW OF POLICIES AND GUIDELINES BACKGROUND This chapter summarizes the findings from the review of policies and guidelines used by state and local transportation agencies. It opens with a broad overview of the criteria in the current edition of the MUTCD and summarizes previous and anticipated changes to the sections of interest.