New User Special Price Expires in

Let's log you in.

Sign in with Facebook


Don't have a StudySoup account? Create one here!


Create a StudySoup account

Be part of our community, it's free to join!

Sign up with Facebook


Create your account
By creating an account you agree to StudySoup's terms and conditions and privacy policy

Already have a StudySoup account? Login here


by: Green Blanda Jr.


Green Blanda Jr.
GPA 3.87


Almost Ready


These notes were just uploaded, and will be ready to view shortly.

Purchase these notes here, or revisit this page.

Either way, we'll remind you when they're ready :)

Preview These Notes for FREE

Get a free preview of these Notes, just enter your email below.

Unlock Preview
Unlock Preview

Preview these materials now for free

Why put in your email? Get access to more of this material and other relevant free materials for your school

View Preview

About this Document

Class Notes
25 ?




Popular in Course

Popular in Physics 2

This 26 page Class Notes was uploaded by Green Blanda Jr. on Wednesday September 2, 2015. The Class Notes belongs to PH 101 at Portland State University taught by Staff in Fall. Since its upload, it has received 34 views. For similar materials see /class/168310/ph-101-portland-state-university in Physics 2 at Portland State University.




Report this Material


What is Karma?


Karma is the currency of StudySoup.

You can buy or earn more Karma at anytime and redeem it for class notes, study guides, flashcards, and more!

Date Created: 09/02/15
lt13 Portlanewgaa CE351 Transportation Systems Planning and Design TOPIC HIGHWAY USERS PERFORMANCE Part III ANOUNCEMENT 39 Updated SCthUIG on lt43 Portlanmaie Course Outline Introouctlon to Iransportatlon Highway Users and their Performance Geometric Design Pavement Design Traffic and Queuing Level of Service in Highways and Intersections lt43 Portlanet at LAST CLASS Vehicle Performance part II Acceleration Braking Force THIS CLASS Stopping Sight Distance SSD Practical vs theoretical formulas Geometric design Vertical Curves r Portlanmax Forces Acting n ehicle whe ra lt43 Portlanei ai Braking Force Ratio Zr 2 front If huf rear Efficiency 77b gmaX u Theoretical Stopping Distance With b mass factor accounting for moments of inertia during braking IOH fUl aULUmUbIIea IIOIII physics stopping distance is V 2 WW S y m 235 V b Fb ZR With resistances V 2 WW Shmj aso VlFb Ra lW i Wsin6g Theoretical Stopping Distance Solving the equation 2 239 be 1 uW KaV1 fer i Wstg 11 nga KaV22 fer i W sm 9g Ignoring alr resnstance Why S 2 ybI12 V22 243 2g77blu fr isian Problem 221 A small truck is to be driven down a 4 grade at 75 mih The coefficient of road adhesion is v30 and it is known that the braking efficiency is 80 when the truck is empty and it decreases by n percentage point for every 100 lb of cargo added Ignoring aerodynamic resistance if the driver wants the truck to be able to achieve a minimum theoretical stopping distance of 300 ft from the point of brake application what is the maximum amount of cargo in pounds that can be carried Practic Stopping Distance Basic physics 101 equation V22 V12 Zad 244 Where deceleration distance practical stopping distance in ft m a acceleration rnegative for deceleration In rtsz gmsz V1 initial vehicle speed in fts ms and V2 final vehicle speed in fts ms Practic Stopping Distance AASHTO 2001 recommends a deceleration rate of 112 fts2 34 ms2 so with grade and V2 0 V12 d 247 Q zgllgliGl g gravitational constant 322 fts2 9807 ms2 G roadway grade for uphill and for downhill in percent100 and Other terms as defined previously lt43 Portlanei at Braking Distance Deceleration used by AASHTO a 112 ftsec2 is the assumption Deceleration used by most drivers Frambro et al 1997 a 184 ftsec2 Is a184 high or low What do you think r Portlanmaie AntiLock Braking Systems ABS can get close to 100 efficiency and avuiu memo locking EBD Electronic brake distribution Performance example NISSAN 3502 060 acceleration 55 seconds 0100 acceleration 140 seconds Peak acceleration g39s 066 Peak braking 339 g322 fts2 r Portlanei ai Relationship Model and Breaking Distance Vehicle Environment lt43 Portlanmat Stopping Sight Distance SSD Worstcase conditions Poor driver skills Low braking ef ciency Wet pavement Perceptionreaction time 25 seconds AASHTO AVERAGE DRIVERS 1 to 15 seconds Equation SSDVJ lt43 Portlanmam QUESTION What would you guess the perceptionreaction time of an average race r 10105 2 0205 3 0305 4 0405 5 0505 lt43 Portlanel at Braking Distance 2 2 Theoretical S 7bV1 V2 ignoring air resistance 2g77bu fr i Sln 67g V12 V22 Practical d a d 2 V12 V22 2gg LG 2a Perception dszltp Total ds ddp Stopping Sight Distance SSD T km W 1139 at wksp 39 i17 l 5392 I 5 quotj 39 g quot V 391 A 39 39 u i 312quot a 77 News Baahereadiam svamepm medma memz szmmrateom mis39i 39 rummmme amramd sight distance from ASSHTO A Policy on Geometric Design of Highways and Streets 2001 3 13 a ea rim i hu i gt 39 r 39 Note this table assumes level grade G 0 SSD Quick and Dirty 1 Acceleration due to gravity 9 322 ftsec2 2 There are 147 ftsec per mph 3 Assume G 0 flat grade 0 VIZ V22 147gtltV12 O Z1472 2gagirG 2gtlt322112322O 2 dp2147gtltV1gtltlp147le 2 2 XLXVZ 21075 V 21075V 112 2 a 2 a deceleration 112 fts2 in U S customary units Conservative perception reaction time 25 seconds ds 21075V 147th V V1 in mph Problem 228 An engineering student claims that a country road can be safely negotiated at 70 mih in rainy weather Because of the winding nature of the road one stretch of level pavement has a iuh distance of only 590 ft Assuming practical stopping distance comment on the student s claim is it safe why or why not Portlanswgaa RECAP r Portlanei ai Relationship Model and Breaking Distance Vehicle Environment lt13 Portlanm Why is vehicle performance important Determines all highway design and traffic operations Defines how transportation engineers must react to advancing vehicle technologies The single most important factor in defining the tradeoff between mobility speed and safety r Portlanmaie Why is vehicle performance important Understand basic tradeoff SAFETY vs COST Cookbook rules for Frequently found design problems Know Basic Principles for Special or custom based problems u N I V E n s TY Other users and vehicles mmm Speeds Walking Speed Ranges from 25 to 65 ftsec typical 4 ftsec Conduct walking studies when large number faster or slower than 4 ftsec Bicycle Speed 812mph very large variations MORE TO FOLLOW ABOUT SPEED STUDIES


Buy Material

Are you sure you want to buy this material for

25 Karma

Buy Material

BOOM! Enjoy Your Free Notes!

We've added these Notes to your profile, click here to view them now.


You're already Subscribed!

Looks like you've already subscribed to StudySoup, you won't need to purchase another subscription to get this material. To access this material simply click 'View Full Document'

Why people love StudySoup

Steve Martinelli UC Los Angeles

"There's no way I would have passed my Organic Chemistry class this semester without the notes and study guides I got from StudySoup."

Anthony Lee UC Santa Barbara

"I bought an awesome study guide, which helped me get an A in my Math 34B class this quarter!"

Jim McGreen Ohio University

"Knowing I can count on the Elite Notetaker in my class allows me to focus on what the professor is saying instead of just scribbling notes the whole time and falling behind."


"Their 'Elite Notetakers' are making over $1,200/month in sales by creating high quality content that helps their classmates in a time of need."

Become an Elite Notetaker and start selling your notes online!

Refund Policy


All subscriptions to StudySoup are paid in full at the time of subscribing. To change your credit card information or to cancel your subscription, go to "Edit Settings". All credit card information will be available there. If you should decide to cancel your subscription, it will continue to be valid until the next payment period, as all payments for the current period were made in advance. For special circumstances, please email


StudySoup has more than 1 million course-specific study resources to help students study smarter. If you’re having trouble finding what you’re looking for, our customer support team can help you find what you need! Feel free to contact them here:

Recurring Subscriptions: If you have canceled your recurring subscription on the day of renewal and have not downloaded any documents, you may request a refund by submitting an email to

Satisfaction Guarantee: If you’re not satisfied with your subscription, you can contact us for further help. Contact must be made within 3 business days of your subscription purchase and your refund request will be subject for review.

Please Note: Refunds can never be provided more than 30 days after the initial purchase date regardless of your activity on the site.