Which US President was most responsible for the development of the US Interstate System?

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Neil Wright
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1 EE 30 Midterm Sample Quetion Short Anwer Which US Preident wa mot reponible for the deelopment of the US Intertate Sytem? Eienhower What metric i ued to calculate interection Leel of Serice? Etimated aerage delay per ehicle Why i automobile traffic typically ignored when calculating paement tructural deign? Indiidual automobile contitute ery low LEF, on the order of 0.00 or le. Therefore, ignoring them doe not appreciably change the oerall ESAL etimate for a paement. A ehicle low from 60 mph down to 30 mph on a flat grade. Uing the tandard AASHTO recommended deceleration rate, what i the braking ditance oer which thi occur? AASHTO recommended deceleration rate =. ft/ec V V d ft a.

2 EE 30 Midterm Sample Quetion Problem A -lane ( ft wide lane) combined horizontal and cret ertical cure i reportedly deigned for 35 mph. Both cure begin at point A and end at point B. Gien the data below, i thi ection of roadway adequately deigned for 35 mph? Show appropriate calculation to upport your concluion. A Horizontal ure Data ure length = 390 ft 60 angle a hown % upereleation M = 5 ft (perpendicular ditance from centerline of inide lane to nearet obtruction) Vertical ure Data ure length = 390 ft G = 6% G = -3.5% G G A B 60 B Plan View Profile View Horizontal ure heck upereleation and radiu: 80L L R R From thi, R = R 6 = 366 ft From The horizontal cure handout with a upereleation of %, 35 mph gie R = 37 ft, therefore the cure i NOT adequate for 35 mph (but almot). heck topping ight ditance (SSD): SSD R 90 co R M R SSD co From Table 3., 35 mph required SSD = 50 ft, therefore the cure i adequate for 35 mph. Vertical ure K L A From Table 3., K = 9 i required for 35 mph. > 9, therefore the cure i adequate for 35 mph. Oerall, the cure i NOT adequate for 35 mph. ft ft

3 EE 30 Midterm Sample Quetion A new paement mut be built for the I-5 off-ramp to the Metro bu facility jut outh of N 75 St. in Shoreline. Aume all bue at the facility are 60 ft Flyer hybrid dieelelectric bue. They are alway empty (one drier only) when they drie acro the offramp and enter the facility. Metro log how an aerage of 00 bue per day ue the offramp with no expected growth rate. The off-ramp paement i to be doweled rigid (portland cement concrete P) paement uing a hot mix aphalt (HMA) bae and 85% reliability. Report the following: The number of ESAL for a ingle bu Total number of ESAL oer 50 year ondition Front axle Weight when bu i empty 3,300 lb Middle axle 8,00 lb Rear axle,00 lb photo by Ned Ahren (from Metro webite) Firt, calculate the number of ESAL per bu: 3,300 8,000 8,00 8,000,00 8, ESAL per bu Now find the total number of ESAL in 50 year (auming no growth rate): ESAL bue day Total year. 3 bu day year million ESAL 3

4 EE 30 Midterm Sample Quetion The road up Mt. Baker i being redeigned to accommodate a 35 mph deign peed. Part of thi road ha an exiting cure with a 80 ft radiu and zero upereleation. Anwer the following quetion about the redeign of thi cure:. If the exiting cure radiu i kept unchanged, what upereleation i required for the cure to accommodate a 35 mph deign peed (ue f = 0.3).. How far back from the edge of the road mut the rock outcropping be to allow adequate ight ditance for a 35 mph deign peed? Plan View of Road 90 ure radiu (R) = 80 ft Two ft. wide lane Find thi ditance for part Rock Outcropping Part Ue the equation for R and ole for e. Firt, notice that with two lane, each ft wide, R i 6 ft le than R R = 7 ft. R V g f e e V gr f or 7% 3. 7 Part You need to firt determine the 35 mph deign topping ight ditance (SSD). Then ue thi in equation 3. from the textbook to determine M. SSD for 35 mph from Table 3. in the book = 50 ft. (calculated alue of 6. i okay too) 90 SSD M R co 7 co 8. 0 R 7 But, M i actually the ditance from the ight obtruction to the center of the inide lane. So, you need to ubtract 6 ft (half the inide lane width) to get the ditance from the edge of the road to the obtruction Ditance = 8.0 ft 6 ft =.0 ft. ft

5 EE 30 Midterm Sample Quetion Refer to the interection diagram below and determine the Leel of Serice for the wetbound approach of thi pre-timed ignal. You will need to determine the ignal timing, including the cycle time and effectie green time for the approach. Aume the following: Saturation flow rate per lane = 800 eh/h Start-up lot time/phae: ec learance lot time/phae = ec µ=800 NB thru =575, EB all =30, WB all =5, NB rt =5 LT NS =+= LT EW =+= LT tot =LT NS +LT EW +LT EW = 5

6 EE 30 Midterm Sample Quetion um c =0.95 LTtot c 0.95 min 59.5 o min =60 c um um min c =0.98 LT min tot g min 3 3 =.9 c g c = d 0.5 g3 g3.9 T=.5, k=0.5, I=.0 d 900T ( ) ( ) 8kI ct d 3 =0 PF= d=d PF+d +d 3 =5.07 which i LOSD (Table 7.)

CEE nd Midterm Examination (50 minutes)

CEE nd Midterm Examination (50 minutes) CEE 30 nd Midterm, Fall 009 CEE 30 nd Midterm Examination (50 minute) Pleae write your name on thi cover. Pleae write you lat name on all other exam page You are allowed to ue one 8.5 by heet of note..