2005-04-27 CC Packet - Laserfiche WebLink

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A description of the plusses and minuses of each alternative is as follows: 1. Diamond a. Plus 1. Has the lowest cost 11. The smallest footprint 1I1. Conventional layout IV. Provides larger distance to adjacent intersections than most alternatives v. Individual ramp signals are relatively simple b. Minus i. Has small reserve capacity ii. Success is dependent upon ramp intersection spacing and an adequate understanding of diamond interchange signal phasing iii. Because of one exit and one entrance per direction, the northbound exit and southbound entrance ramps will require two lanes. 2. Diamond plus northwest loop a. Plus J. Addition ofloop adds capacity 11. Conventional layout 1I1. Could have two single lane entrances rather than a two lane entrance iv. Greater spacing between ramp intersections v. May have smaller bridge VI. Requires less right-of-way in northeast and south east quadrants Vll. Could make connections to southwest quadrant easier Vlll. Could be designed to allow for later addition of inverted loop b. Minus i. Northbound exit ramp will need two lane design ii. Adds delay to westbound to southbound move when compared to the Parclo "A" with C-D roadway 3. Diamond with northwest loop and no southwest ramp a. Plus 1. Addition ofloop adds capacity 11. Conventional layout iii. Greater spacing between ramp intersections iv. May have smaller bridge v. Requires less right-of-way in northeast and south east quadrants vi. Connections to southwest quadrant easier b. Minus i. Northbound exit ramp will need two lane design ii. Adds delay to westbound to southbound move when compared to the Parclo "A" with C-D roadway iii. Has single entrance loop which needs to have two lanes IV. Eastbound to southbound right turn will be too large for this design