LT1: Development, calibration and validation of bus following model
1. LT1: Development, calibration and validation of
bus-following model to support analysis and
evaluation of alternative BRT strategies under
different scenarios
Luis Antonio Lindau
Paula Manoela dos Santos
2. Mile-
OUTPUTS
stones
M1 Do vehicle-following literature review
M2 Check potential of existing models to represent bus behavior
M3 Select data collection technique
M4 Plan field data collection
M5 Collect data
M6 Process data
M7 Define bus-following model
M8 Final report
Transit Leaders Roundtable MIT, June 2011
3. Comparing: GHR and Gipps
GHR reveled unstable for typical Gipps is attractive for successive
bus stopping maneuvers. stopping buses.
1 0,6
0,5 0,4
0 0,2
acceleration (m/s²)
0 20 40 60 80 100 120 140
acceleration (m/s²))
-0,5 0
0 50 100 150 200
-1 -0,2
-1,5 -0,4
-2 -0,6
-2,5
time (s) -0,8
time (s)
5. Solution: image recognition software Kinovea 0.8.15
• Developed
for studying
athletic
techniques
• free and
open source
• 33 info/s
6. Paralaxis correction
𝐶1 +𝐶2 𝑋 𝑓 +𝐶3 𝑌 𝑓 𝐶6 +𝐶7 𝑋 𝑓 +𝐶8 𝑌 𝑓
𝑋𝑟 = 𝐶4 𝑋 𝑓 +𝐶5 𝑌 𝑓 +1
𝑌𝑟 = 𝐶4 𝑋 𝑓 +𝐶5 𝑌 𝑓 +1
Bleyl, R. L. (1972) Traffic analysis of time lapse photographs without employing a perspective grid. Traffic
Engineering, p. 29-31.
7. Methodology
Find a setting to film Locate and measure 4 reference points
Film making (with vehicle loading Film analysis with image recognition
estimation) software
Data collection (distance vs. time) Calibration of parameters