Study Details
Study Title: Community-Based Macro-Level Collision Prediction Models for Evaluating Road Safety Levels of Left-Turn and On-Street Parking Restrictions on Major Urban Corridors
Authors: Sun et al.
Publication Date:JAN, 2009
Abstract: The enormous social and economic burden imposed on society by injuries due to road collisions is a major global problem. Road authorities worldwide are researching ways to reduce this burden. Due to this ongoing work, a possible road collision pattern was discovered by the Insurance Corporation of British Columbia (ICBC) regarding factors related to unsignalized intersections. This pattern involved turning movements onto and off of major arterial routes at intersections without signalization as well as parking adjacent to such intersections. This study was commissioned to evaluate the road safety impacts on neighbourhoods from banning left-turn and/or parking along urban arterial corridors at unsignalized intersections. Using recommended generalized linear regression modeling (GLIM) techniques, community based, macro-level collision prediction models (CPMs) were developed. Data was based on four arterial corridors in the City of Vancouver - Knight Street, Granville Street, Broadway Avenue, and 12th Avenue/Grandview Highway, including: collision claim, road attribute, and adjacent neighbourhood trait data from 44 Traffic Analysis Zones (TAZs). Four land use stratifications were made in the data: Total, Residential, Mixed, and Commercial. Assuming a negative binomial residual distribution and standard statistical goodness of fit tests at a 95% level of confidence, ten new CPMs were successfully developed for total and rush hour (AM and PM) collision types. The models revealed that decreased collisions were associated with increases in restricted parking hours and left-turn hours at unsignalized intersections on urban arterial corridors. Further research is recommended, including application of these new models.
Study Citation: Sun, J., G. Lovegrove, J. Pump, and G. Cockburn, "Community-Based Macro-Level Collision Prediction Models for Evaluating Road Safety Levels of Left-Turn and On-Street Parking Restrictions on Major Urban Corridors." TRB 88th Annual Meeting Compendium of Papers CD-ROM. Washington, D.C., (2009).
CMFs Associated With This Study
Category: On-street parking
Countermeasure: Change unrestricted left turn hours during rush hour from X to Y hours
| CMF | CRF(%) | Quality | Crash Type | Crash Severity | Roadway Type | Area Type |
|---|---|---|---|---|---|---|
 | |  | All | All | Principal Arterial Other | Urban |
Countermeasure: Change unrestricted left turn hours during rush hour from X to Y hours (residential and mixed land use)
| CMF | CRF(%) | Quality | Crash Type | Crash Severity | Roadway Type | Area Type |
|---|---|---|---|---|---|---|
| | | All | All | Principal Arterial Other | Urban |
Countermeasure: Change unrestricted left turn hours during rush hour from X to Y hours (residential areas)
| CMF | CRF(%) | Quality | Crash Type | Crash Severity | Roadway Type | Area Type |
|---|---|---|---|---|---|---|
| | | All | All | Principal Arterial Other | Urban |
Countermeasure: Change unrestricted left turn hours from X to Y hours
| CMF | CRF(%) | Quality | Crash Type | Crash Severity | Roadway Type | Area Type |
|---|---|---|---|---|---|---|
| | | All | All | Principal Arterial Other | Urban |
Countermeasure: Change unrestricted left turn hours from X to Y hours (residental areas)
| CMF | CRF(%) | Quality | Crash Type | Crash Severity | Roadway Type | Area Type |
|---|---|---|---|---|---|---|
| | | All | All | Principal Arterial Other | Urban |
Countermeasure: Change unrestricted left turn hours from X to Y hours (residential and mixed land use)
| CMF | CRF(%) | Quality | Crash Type | Crash Severity | Roadway Type | Area Type |
|---|---|---|---|---|---|---|
| | | All | All | Principal Arterial Other | Urban |
Countermeasure: Change unrestricted parking hours during rush hour from X to Y hours
| CMF | CRF(%) | Quality | Crash Type | Crash Severity | Roadway Type | Area Type |
|---|---|---|---|---|---|---|
| | | All | All | Principal Arterial Other | Urban |
Countermeasure: Change unrestricted parking hours from X to Y hours
| CMF | CRF(%) | Quality | Crash Type | Crash Severity | Roadway Type | Area Type |
|---|---|---|---|---|---|---|
| | | All | All | Principal Arterial Other | Urban |
| | | All | All | Principal Arterial Other | Urban |
| | | All | All | Principal Arterial Other | Urban |
