ECAT Example Exercises

Exercise 1: Mainline Freeway Segment 1 (Session 3)

Exercise 2: Mainline Freeway Segment 2 (Session 3)

Exercise 3: Ramp Segment (Session 3)

Exercise 4: Ramp Terminal Configuration (Session 3)

Exercise 5: Full Interchange (Session 4)

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Session 3 Exercise 1: Mainline Freeway Segment 1

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Session 3  Exercise 2: Mainline Freeway Segment 2

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Session 3 Exercise 3: Ramp Segment

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TYPICAL SECTIONS

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Session 3 Exercise 4: Ramp Terminal Configuration

A4 Configuration Signal control ¼ mile to next intersection 800 feet between terminals Crossroad

o 12’ median widtho 4 lanes both approacheso 2 lane exit ramp approach

Right turns yield No right turn bays

D4 Configuration Signal control ¼ mile to next intersection 800 feet between terminals Left turns protected

o Channelizedo 12 foot lanes

Right turns yieldo Channelized

Crossroado 12’ median widtho 4 lanes both approacheso 2 lane exit ramp approach

Exit ramp approach channelized No outisde approach right turn bay 1 driveway on outside crossroad

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A4 Configuration

D4 Configuration

Session 4 Exercise 5: Full Interchange 

PRE RECONSTRUCTION CONFIGURATION ASSUMPTIONS 

Design Element  Dimensions/ Assumptions Mainline number of basic lanes  4Mainline lane width  12’ Mainline outside shoulder width  10’Mainline inside shoulder width  4’ Mainline median width  72’Clear zone  30’Mainline median barrier width  2’ or 56' (segment 3) Nearest distance from edge of travelled way to median barrier face 8’Outside barrier offset from edge of shoulder 2’Rumble strips  Not present Ramp right shoulder width  9’ Ramp left shoulder width 4’Diamond ramp lane width  16’ Loop ramp lane width  17.5’Average freeway traffic speed  60 MPH 

POST RECONSTRUCTION CONFIGURATION ASSUMPTIONS 

Design Element  Dimensions/ Assumptions Mainline number of basic lanes  6 west end and core, 8 east end Mainline lane width  12’ Mainline outside shoulder width  10’Mainline inside shoulder width  10’ Mainline median width  Varies, 40’‐52’ (40', 48', 52') Clear zone  30’Mainline median cable barrier width  1’ Nearest distance from edge of travelled way to median barrier face  15’ Nearest distance from edge of travelled way to outside shoulder barrier face 12’ Outside barrier offset from edge of shoulder 2’Rumble strips  Not present Ramp right shoulder width  6’ Ramp left shoulder width 4’Diamond ramp lane width  16’ 2‐lane ramp lane width  12’ 2‐lane ramp right shoulder width  8’ 2‐lane ramp left shoulder width  6’ Loop ramp lane width  16’Average freeway traffic speed  60 MPH 

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PC Sta 405+72.30

PT Sta 406+83.84

PC Sta 408+22.51

PT Sta 409+94.08

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INCREASING MILEPOST

42200 AADT

MAINLINE

AADTNUMBER

RAMP

1

2

3

4

5

6

7

325

3200

1950

3150

3150

3250

2650

4000 200

SCALE IN FEET

Segment 1 Sta 15+00 to Sta 27+00Segment 2 Sta 27+00 to Sta 39+00Segment 3 Sta 39+00 to Sta 54+00

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PC Sta 206+26.10

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42200 AADT

MAINLINE

AADTNUMBER

RAMP

1

2

3

4

6

7

325

3200

1950

3250

2650

6300

4000 200

SCALE IN FEET

Segment 1 Sta 15+00 to Sta 27+00Segment 2 Sta 27+00 to Sta 39+00Segment 3 Sta 39+00 to Sta 54+00

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② ③