VTrack - VTrack ArvindThiagarajan,LeninRavindranath

Info iconThis preview shows pages 1–10. Sign up to view the full content.

View Full Document Right Arrow Icon
Click to edit Master subtitle style  8/25/11 VTrack Presented By:  Lauren Ball March 2, 2011 Arvind Thiagarajan, Lenin Ravindranath , Katrina LaCurts, Sivan Toledo, Jakob  Eriksson, Hari Balakrishnan , Samuel Madden, "VTrack : Accurate, Energy-Aware Road Traffic Delay Es SenSys, November 2009. 
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
 8/25/11 Road Traffic Problem Results Causes inefficiency Fuel Waste Frustration (not measuring this here  ) Trends More cars on road (1B now and projected to double) More time wasted in traffic (4.2B Hrs in 2007 and increasing) Smartphone Capabilities Background
Background image of page 2
 8/25/11 Real-time traffic information can alleviate congestion  with information Collected Travel Time Collected Vehicle Flow Densities Alleviation Methods Informing drivers of “Hotspots” to avoid Traffic aware routing Combining historic and real-time information Update traffic light control Previous Work
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
 8/25/11 MIT CSAIL, Tel-Aviv Univ, and Univ Illinois Chicago Goal Accurate, Energy-Aware Road Traffic Delay Estimation Using  Mobile Phones GPS Limitations “Urban Canyon” outages Pocket outage Power Hungry Key Challenges What is VTrack?
Background image of page 4
 8/25/11 System Architecture Users with smartphones Run VTrack reporting  application Report position data  periodically to the server
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
 8/25/11 VTrack Server Server algorithm  components Map-matcher Travel-time estimator If GPS not available Access point (AP) observations are  used AP observations converted to  position estimates Done via the wardriving  database where APs have been  in previous drives
Background image of page 6
 8/25/11 “Hotspot” Reporter Senses Traffic Anomalies Reports Segments with Rate << Speed Limit Optimized for low miss rate Optimized for false positive Route Planner Plans Least Time path Uses individual segment estimated from VTrack  VTrack Application Support
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
 8/25/11 Users have access Users can view current traffic delays Users can receive route planning updates VTrack Website
Background image of page 8
 8/25/11 Accurate
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 10
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 25

VTrack - VTrack ArvindThiagarajan,LeninRavindranath

This preview shows document pages 1 - 10. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online