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Location : City Government > Departments > Development Services > Traffic Engineering > Traffic Collision Statistics
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THREE YEAR INTERSECTION ACCIDENT ALERT LISTING FOR 2007

 

One of the functions of the Traffic Engineering Department of the City of Ponca City is to monitor traffic accidents in the city and to recommend corrective action based on accident analysis.  The department uses a rating system to rank intersections by number and severity of accidents and traffic volume.  The number of intersections meeting criteria for inclusion on the accident alert list has ranged from a high of 27 in 1980 to a low of seven in 2001.  This report presents the department’s findings and recommendations for calendar year 2007 based on accidents which occurred from 2005 to 2007.

 

The eight intersections on this year’s list comprise 0.8% of the city’s intersections but account for 18.7% of all intersection accidents and 23.3% of intersection injury accidents from 2005 to 2007.  All of the intersections listed this year are controlled by traffic signals.

 

No. 1 – Highland & Waverly

This intersection has risen from third to second to first over the past three years.  All collisions in the past three years have been head-on/left turn accidents or right-angle accidents.  75% of the head-on/left turn accidents have involved north/south movements.  Twelve of the 15 accidents that occurred over the past three years have involved injuries.  A traffic signal was installed here in July of 2004.  Collision frequency and accident severity have increased over each of the past three years.  Signal phasing changes to protect north/south left turns are recommended.  This work would involve adding left turn signal heads to the mast arms for north/south traffic and restriping the approach lanes to distinguish the inside lanes as exclusive left turn bays.

 

No. 2 – Fourteenth & Hubbard

The majority of accidents have been right angle with most of those in the southeast quadrant.  This intersection was taken into the city limits in September, 2004.  The traffic signal went into operation in April of 2005.  Accident frequency dropped from eight in 2005 to three in 2006 to two in 2007.  No action is recommended at this time other than continued monitoring.

 

No. 3 – Fourteenth & Grand

North/south left turn collisions account for 59% of total intersection accidents.  Traffic volume has remained steady and severity ratings have increased in recent years.  This intersection has met criteria for the accident alert list each year since 2003 and continues to climb in rank.  Construction of north/south left turn bays will be necessary to reduce the number of head-on/left turn collisions.  A request to fund engineering and construction of left turn bays on 14th Street has been included in the capital budget request for fiscal year 2008/09.

 

No.4 – Grand & Pine

Collision frequency and severity have dropped over past three years.  The majority of collisions are right angle with half occurring in the southeast quadrant.  No action is recommended at this time other than continued monitoring.

No. 5 – South Av. & Waverly

This is a signalized intersection with separate left turn bays on all approaches.  A protected/permitted left turn signal was installed for southbound left turns in 2003.  There have been three southbound left turn collisions since that time.  There is no predominant accident pattern.  Accident frequency rose from three in 2006 to five in 2007 and severity ratings have increased for the past four years.  Recommend continued monitoring for developing accident patterns and increased frequency or severity.

No. 6 – Highland, Seventh, & Virginia

This intersection has been on the alert list since 1991.  Traffic volume has remained steady over the past three years.  Accident frequency and severity have remained relatively constant over the past three years.  This intersection consistently makes the accident alert list due to accidents involving east/west left turns.  Separate left turn bays on Highland would reduce the frequency of accidents.  A budget request for engineering and construction of left turn bays on Highland has been submitted for fiscal year 2008/09.

 

No. 7 – Fourteenth & Prospect

This is the second year in a row this intersection has met the criteria for the accident alert list.  Last year it was ranked ninth.  70% of all accidents are rear-end collisions with most of those involving southbound traffic.  Accident frequency has remained steady and severity ratings are fluctuating.  Increasing the length of yellow clearance intervals can sometimes reduce the frequency of rear-end collisions.  Those timings were increased on April 20, 2007 with seemingly no effect on the southbound rear-end collision accident rate.  An in depth analysis of this intersection will be conducted to determine possible remedial action.

 

No. 8 – Fourteenth & Harding

This is the fifth year in a row Fourteenth and Harding has been on the accident alert list but is has dropped in rank.  The intersection is controlled by a fully vehicle actuated traffic signal with separate left turn bays on all approaches.  Right angle collisions account for 45% of the three-year total accidents and rear-end collisions account for 27% of total accidents.  Right-angle accidents at signalized intersections are nearly always due to carelessness and disregarding the traffic signal and are difficult to address.  The majority of rear-end collisions in the past involved the sweeping westbound right turn to the north.  Vehicles making the turn stopped and waited to merge into northbound through traffic and got hit from behind.  The new four-lane section on Fourteenth addressed that problem by providing drivers an additional lane in which to merge and/or shift.  There were no accidents of this type in 2006 or 2007.  Recommend no action other than continued monitoring.

 

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