$ 1,740 Avg. cost for a driver caused by VOC, congestion and crashes,

(total cost per year - TX residents)

19% % of intersections that are in need for repair in the DFW region

45 hours No. of hrs. lost in congestion / individual / year in the DFW region

**Cited from TRIP (a national transportation research group - July ‘14)

$ 25.1 billion

* VOC —> Vehicle Operating Costs (including fuel)

1. What is a DDI?

Do you know the DDI better than the rest?

A. Destructive Devices Industry

B. Development Dimensions International

C. Device Dependent Interface

D. Diverging Diamond Interchange

2. By what % does the DDI reduce traffic?

Do you know the DDI better than the rest?

A. 20% - 30% B. 30% - 40%

C. 40% - 50% D. 50% - 60%

VIDEO DELETED TO REDUCE SPACE

3. Based on historical data, by what % have crashes reduced because of the DDI?

Do you know the DDI better than the rest?

A. 60 % B. 20 %

C. 50 % D. 30 %

4. What is the typical cost of constructing the DDI compared to an alternative design?

Do you know the DDI better than the rest?

A. 60 - 70 % less B. 10 - 20 % more

C. 40 - 50 % more D. 20 - 30 % less

Decision Support System

Diverging Diamond Interchangefor the DDIDSS

Prepared by:Ade KelekoBrian Sturm

Maithreya ChakravarthulaMargaret Quintero

Mary KimPhillip Watz

Saad Aziz

VIDEO DELETED TO

REDUCE SPACE

Agenda• Review of the data and the data sources used - raw and predicted data

• Description of the database and the relations between tables (access)

• Explanation of the analytics layer on excel

• Showcase of the user interface

• Preview of the presentation layer

Objectives!• Develop a ‘traffic decision-support system’

• Identify viable intersection locations

• Ranking of candidate intersections for DDI

• Documentation of prototype (include analysis, design, and creation)

DATA: (Comprehensive traffic & toll revenue study by NTTA)

RESULTS

SCALED SCALED

- Safety

- Time

- Cost

AFTER ANALYSIS

Safety

Time Cost

Preston / SRT

City: Plano

Authority: NTTA

Avg. Daily Total Traffic: 96250 vehicles (E-W bound) / yr*During 4 peak periods

% of left turns: 25 %

Existing Lane Width: 14 Feet- Safety

- Time

- Cost

Sample Data

Excel Datasheet

Daily Total Traffic: 300 vehicles

Preston / SRT

Comparison between a DDI & a conventional interchange

DDI

Average delay per vehicle

Standard

21.1 sec5 sec

Average delay @ Preston / SRT 1500 sec 6330 sec25 min 105 min

* Per day

* Per day for 300 vehicles

Average Delay / year: 133 Hrs. 564 Hrs.

reduction in delay!!76 %

** Gathered the data fromhttp://www.hdrinc.com/sites/all/files/content/white-papers/white-paper-images/4623-diverging-diamond-interchanges-answers-to-frequently-asked-questions.pdf

Impact of intersection types for “SRT / Preston”

*Higher score the better

reduction in traffic50 % reduction in Cost75 % reduction in 911 Delays25 %

Benefits of a DDI

ARCHITECTURE

NTTA.org

TXDOT.gov

ATTProvided

OtherMisc.sources

SQL(DataBase)

MSAccess(BackupDatabase)

DATABASELAYER ANALYTICSLAYER USERINTERFACELAYER PRESENTATIONLAYER

DEMO