ITS Lab Members

1st year M.S. Student in Civil Engineering Areas of Interest

Traffic Flow Theory Intelligent Transportation Systems

Possible Thesis Topics: Uncertainty Propagation in Traffic Flow Models or Bottleneck Identification using FOTO and ASDA Models

1Meead Saberi K.

Meead Saberi K.

ITS Lab Members

• Dealing with two large databases of traffic data and weather data (PORTAL)

• Traffic and weather data fusion and quality

2Meead Saberi K.

Effects of Weather on Traffic Flow on Freeways

ITS Lab Members

• Effects of precipitation, visibility and wind speed on: speed and flow (average, standard deviation, and statistical significance)

• Probabilistic Approach: using cumulative distribution function

3Meead Saberi K.

Effects of Weather on Traffic Flow on Freeways

35

40

45

50

55

60

6 7 8 9 10 11Time

Spe

ed

No Rain Very Light Rain Light Rain Moderate Rain

0

5

10

15

20

25

30

35

40

45

50

10andless

10-15 15-20 20-25 25-30 30-35 35-40 40-45 45-50 50-55 55-60 60and

more

Speed (mph)

Freq

uenc

y (%

)

No RainRainy

0

10

20

30

40

50

60

70

80

90

100

10 15 20 25 30 35 40 45 50 55 60

Average Speed (mph)

1 - C

umul

uativ

e D

istri

butio

n Fu

nctio

n

ITS Lab Members

4Meead Saberi K.

Segment Level Analysis of Travel Time Reliability

1

2

3

4

5

6

7

8

0:00 6:00 12:00 18:00

Time of Day

Trav

el T

ime

Cost

($)

Average Travel Time Standard Deviation of Travel Time

Breaking the overall I-5 NB freeway into shorter segments; this study shows how travel time reliability can vary across freeway segments using different reliability measures.

ITS Lab Members

5Meead Saberi K.

Segment Level Analysis of Travel Time Reliability

0:00 2:15 4:306:45 9:00

11:15 13:30 15:4518:00 20:15 22:30

286.1

289.4

290.54

293.18

295.18

296.6

299.7

302.5

304.4

306.51

307.9

0.00

0.25

0.50

0.75

1.00

1.25

1.50

0

0.2

0.4

0.6

0.8

1

1.2

1.4

286.

1

286.

3

289.

4

289.

6

290.

5

292.

2

293.

2

293.

7

295.

2

296.

3

296.

6

297.

3

299.

7

301.

1

302.

5

303.

9

304.

4

305.

1

306.

5

307.

5

307.

9

S e g me n t

Buff

er In

dex

n

i jijii SSSVarCVar

1

),cov(2)()(

• Segment ranking based on travel time reliability

• Reliability of corridor vs. segments