1.
Traffic Safety on Bus Corridors
Overview
Background: 2-year research project
Main findings regarding safety on bus and BRT corridors
Development of design guidelines
Road safety auditing: Rio s BRT corridors

2.
Traffic Safety on Bus Corridors
Cities included in the study

3.
Main findings: Overall safety impact of a BRT
Macrobús, Guadalajara

4.
Main findings: Overall safety impact of a BRT
Macrobús, Guadalajara
250 5000
Before BRT During BRT construction After start of operations
4500
Citywide crashes
200 4000
3500
150 3000
2500
100 2000
1500
50 1000
500
0 0

5.
Main findings: Overall safety impact of a BRT / Busway
Not all systems have had a positive impact on safety
Cristiano Machado Busway, Belo Horizonte
Corridor with the highest crash
frequency citywide
BRTS, Delhi
Initial increase in fatalities after the
implementation of the bus system

6.
Overview of the research
Methodology
Crash data collection and analysis
Road safety audits and inspections
Discussions with safety experts from bus agencies
Road test and review: getting feedback to improve the guidelines

7.
Overview of the research
Data analysis
Example: Results from the Mexico City intersection model
Vehicle collision model (NB) Pedestrian crash model (NB)
Coef. Coef.
Constant -1.518*** -1.857***
Number of legs 0.374*** 0.252***
Number of lanes per leg 0.374*** 0.341***
Left turns per approach 1.705*** 1.268**
Market area - 0.664***
Maximum pedestrian crossing distance (m) - 0.026**
Pedestrian overpass - -0.147
Center-lane BRT (Metrobus Line 1) -0.029 -0.299
Counterflow bus lane 0.554*** 0.389**
Curbside bus lane -0.176 -0.087
No. of observations 216 216
Log likelihood -618.475 -518.539
LR chi2 139.99 104.88
Prob > chi2 0.000 0.000
chibar2(01) 367.14 231.39
Prob >=chibar2 0.000 0.000
*** p<=0.001, ** p<=0.05, * p<=0.1, - variable not included in the model

8.
Overview of the research
Road safety inspections
Detailed inspection of operating BRT corridors (here, Av. Caracas,
TransMilenio) together with certified road safety auditors

9.
Overview of the research
Road safety audits
Identifying safety issues in project drawings for BRT or bus
corridors and suggesting improvements

10.
Overview of the research
Main findings

11.
Factors influencing crash frequencies
Counterflow
Counterflow lanes were strongly correlated with higher
crash frequencies across all our models (p<0.001)

12.
Factors influencing crash frequencies
Street width and intersection size and complexity
Road width and complexity of intersections were the most important predictors of
crash frequencies.
Metrobus Line 1, Mexico City

13.
Factors influencing crash frequencies
Location of bus lanes
Central median
Shorter pedestrian crossings
Fewer mixed traffic lanes
Some 4-way intersections turned into
T junctions

14.
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15.
3500
3000
2500
Acidentes por ano
2000
Sem vítimas
No injury
1500 Injury vítimas
Com
1000
500
0
2008 2009 2010
Fonte: CET-Rio

16.
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
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Fonte: CET-Rio, IPEA

17.
Se as recomendações forem incorporadas:
Redução da gravidade dos acidentes
A cada ano serão evitados (*):
800 acidentes
200 vítimas,
incluindo 10 fatalidades
(*) há casos onde a simples implantação de um corredor de ônibus
levou a um aumento da incidência e gravidade de acidentes