Intersection Control and Warrants.pdf

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CEE 463/663 – Fall 2006. Intersection Control. ➢ Hierarchy of intersection control . ○ Unsignalized. • Uncontrolled. • Yield. • Stop controlled. TWSC. AWSC.
Topic 2 (Chapter 16)

Intersection Control

CEE 463/663 – Fall 2006

Intersection Control ¾

Hierarchy of intersection control z

Unsignalized • • •

Uncontrolled Yield Stop controlled TWSC AWSC • Roundabout

z

Signalized

CEE 463/663 – Fall 2006

Traffic Signals ¾

Is signal control always better? z z

¾

Advantages Disadvantages

MUTCD Signal Warrants z z

What does a warrant mean? Eight signal warrants (pp.455 – 462) • #1: Eight-hour vehicular volume • #2: Four-hour vehicular volume • #3: Peak-hour vehicular volume • #7: Crash experience • Other (#4, #5, #6, #8)

CEE 463/663 – Fall 2006

Signal Warrants ¾

Warrant #1: Eight-hour vehicular volume z

z z z z z

Volume: Major - both directions; Minor - highest approach Any 8 hour, but the same period for both streets Two conditions: A, B Either A or B at 100% level Either A or B at 70% level with rural communities Both A and B at 80% level

CEE 463/663 – Fall 2006

CEE 463/663 – Fall 2006

Signal Warrants ¾

Warrant #2: Four-hour vehicular volume z

z z z

Volume: Major - both directions; Minor - highest approach Any 4 hour, but the same period for both streets 100% level and 70% level (rural) A minimum minor street volume threshold

CEE 463/663 – Fall 2006

CEE 463/663 – Fall 2006

CEE 463/663 – Fall 2006

Signal Warrants ¾

Warrant #3: Peak-hour z

Volume Warrant • Similar to 4-hour volume

z

Delay Warrant (Stop Control) – All 3 Conditions • Minor Approach Delay: 4 veh-hr (one lane); 5 veh-hr (two lanes) • Minor Approach Volume: 100 vph (one lane); 150 vph (two lanes) • Total Entering Volume: 650 vph (3 leg); 800 vph (4 leg)

CEE 463/663 – Fall 2006

CEE 463/663 – Fall 2006

CEE 463/663 – Fall 2006

Peak Hour Delay (Single-Lane, 4 veh-hr) 160

Average Delay, veh/sec

140 120 100 80 60 40 20 0 0

100

200

300

400

Minor Street Approach Volume, vph

CEE 463/663 – Fall 2006

500

600

Signal Warrant Example East-west is the major street with two lanes on each direction. North-south is the minor street with one lane on each direction. Determine if the intersection meets the 4-hr volume warrant Major Street Volume, vph

Minor Street Volume, vph

Time

EB

WB

Total

NB

SB

11 amam-12 1212-1PM 1-2 PM 2-3 PM 3-4 PM 4-5 PM 5-6 PM 6-7 PM 7-8 PM 8-9 PM 9-10 PM 1010-11 PM

400 450 485 525 515 540 550 545 505 485 475 400

425 465 500 525 525 550 580 528 506 490 475 410

825 915 985 1050 1040 1090 1130 1070 1011 975 950 810

75 85 90 110 100 90 110 96 90 85 75 50

80 85 100 115 95 100 125 103 95 75 60 55

CEE 463/663 – Fall 2006

Highest

CEE 463/663 – Fall 2006

Signal Warrants ¾ Warrant #7: Crash experience z z

Five or more crashes in a year Warrant 1A or 1B at 80% level

CEE 463/663 – Fall 2006

Signal Warrants ¾ Warrant #7: Crash experience z z

Five or more crashes in a year Volume Warrant

CEE 463/663 – Fall 2006

MUTCD ¾ ¾

Detailed information about the MUTCD can be found in Chapter 4 Four Categories z z z z

Standard – “Shall” Guidance – “Should” Option – “May be” Support – Fact

CEE 463/663 – Fall 2006

Traffic Signs ¾ ¾ ¾

Regulatory signs Warning signs Guide signs

CEE 463/663 – Fall 2006

Regulatory Signs – Right of Way

CEE 463/663 – Fall 2006

Regulatory Signs – Speed Limit

CEE 463/663 – Fall 2006

Regulatory Signs – Lane Use

CEE 463/663 – Fall 2006

Warning Signs – Horizontal Change

CEE 463/663 – Fall 2006

Warning Signs – Vertical Change

CEE 463/663 – Fall 2006

Warning Signs – Advance Traffic Control

CEE 463/663 – Fall 2006

Warning Signs – Others

CEE 463/663 – Fall 2006

Guide Signs

CEE 463/663 – Fall 2006

Dynamic Message Signs (DMS)

CEE 463/663 – Fall 2006