Towson Roundabout Data Collection by JMT Engineering

Note: This blog has been guest submitted by Clyde Munz of Johnson, Mirmiran & Thompson, Inc. (JMT).

Traffic Count Project Details

JMT was assigned with collecting traffic counts for 36 signalized intersections and one five–legged oblong roundabout – the Towson Roundabout. Of the 37 intersections, 32 of the counts had to be for a 24 hour period.

The Challenge of Roundabout Data Collection at the Towson Roundabout

towson roundabout map

The Towson Roundabout is an oblong five-legged traffic circle that brings five busy roadways together. The roundabout is approximately 200 feet along the East – West orientation and approximately 80 feet in the North – South direction.

Collaborating with Miovision for Roundabout Data Collection

JMT worked with Miovision to ensure the best results for capturing this difficult roundabout. JMT contacted several business to get access to their roofs in the hope one may be an optimum vantage point to view and capture the entire roundabout for data collection with one or two Miovision cameras. The scouting mission showed that a roof top view did not lend itself as a good vantage point.

Miovision worked with JMT to locate the best ground placement for cameras to accurately capture the traffic destinations through the roundabout. The study came out with a 93% accuracy rate. The data was compared with existing data at the five approaches and confirmed the success of the traffic study.

Miovision’s Technical Sales Engineer, Brent Rogerson, was instrumental in helping JMT set-up the cameras for the best possible data collection.

Miovision: Brent has significant experience working 1:1 with customers to properly deploy Scout video collection units at unique and challenging locations. Brent lends his expertise when customers are unsure where to deploy Scouts, and also when multiple Scouts are required for a single location to ensure the best data accuracy.

Below is the email that Brent provided to JMT:

Hi Clyde, Here is a map of the ideal camera placements (orange circles). I added a 5th camera to be conservative but you may be able to stretch the 4th camera to get Green and Blue. Each color represents the movements we need to see from at least one full camera view. If you are able to get these movements then we can utilize or software to run the data and compile into a 5 leg roundabout report. Each Arrow is as far as we need to see, so where the arrow stops and starts is exactly where the range of view needs to be. Hope that is clear. If we cannot see these movements in full, we will have to use the back-up plan of two separate intersections.towson roundabout full sizePlease keep in mind (as discussed) that 95% cannot be guaranteed at these distances here, but if your able to capture these movements as illustrated, 90% can be realistic.

Yellow, Red and Green would be the movements at most risk, but with the trees clear it should be much clearer here.
Pedestrians may need to be from separate cameras.

Hope that helps guide you in the right direction and options for this study.

Let me know if you want to talk further.


Choosing Miovision for Data Collection

Tasked with this assignment, Miovision became the logical choice to gather these 24 hour counts and the 24 hour Towson Roundabout study. By utilizing Miovision cameras, our team was able to complete the counts accurately, within budget and on time despite being tasked with this assignment in January with weather becoming an added challenging aspect to the task.


About JMT

printLogojmtFounded in 1971, JMT is a 100% employee-owned firm that provides a full range of multi-disciplined engineering, architectural, and related services to public agencies and private clients throughout the United States. Our staff of more than 1,000 professionals — engineers, architects, planners, environmental scientists, surveyors, construction and program managers, inspectors, designers, CADD technicians, and GIS and information technology specialists — is dedicated to the highest-quality project performance.

JMT has grown considerably during the past four decades.  The company was founded primarily to perform engineering services in support of land development projects.  In 1979, JMT entered the public works market by focusing on transportation engineering for Federal, state and local public agencies. Over time, JMT extensively diversified both our service offerings and our client base.

Today, JMT provides consulting services to a wide variety of public and private entities.  This diversification of markets and services has resulted in considerable geographic expansion from our original office in Silver Spring, Maryland, to strategically located offices across the United States.