INDOT prequalifies engineers for certain type of work based on their experience and past performance. Yarger Engineering is prequalified for the following types:
- 1.1 Systems Planning
- 2.2 Traffic Forecasting
- 3.1 Non-Complex Traffic Capacity Analysis and Operational Analysis
- 3.2 Complex Traffic Capacity Analysis and Operational Analysis
- 8.1 Non-Complex Road Design
- 10.1 Traffic Signal Design
1.1 Systems planning involves the defining objectives, documentation and analysis of the existing conditions, and developing, analyzing and screening alternatives to address the objectives of the study.
2.2 Traffic forecasting involves just what it says, forecasting traffic. It uses many methods, but generally involves existing traffic volumes, background growth rates, traffic forecasts from proposed land uses for various design years, directional distribution, and assignment to the existing and future traffic networks. While mass transit is only a minor concern in most of Indiana, modal split for cars, trucks, buses, walking and bicycling can be an important component in some cases. Traffic can be forecasted for roadways or even individual turning movements at intersections.
3.1 and 3.2 Traffic capacity analysis is the activity of analyzing how well or poorly the roads are working. Normally the level of service is determined by applying methods from the Highway Capacity Manual for roadway sections, ramps, intersections and even sidewalks. Entire street sections can also be analyzed in a number of ways for multimodal uses. There are various methods for signals, signs and roundabouts that include traffic simulation. Complex analyses typically involve more than one analysis of an isolated item. A street with coordinated traffic signals, stop signs, and pedestrians would be an example where the movement between the intersections and interaction between the vehicles and pedestrians need to be understood as a whole.
8.1 Non-complex road design involves the design of normal roads and intersections. It is different from complex road design in that it does not include significant lengths of new road through an urban area, intricate geometry such as freeway to freeway interchanges, or the reconstruction of significant lengths of multilane highways. These complex items require multiple engineers on staff to qualify for INDOT prequalification. Mr. Yarger is capable of designing such items, but Yarger Engineering, Inc. doesn’t have a second engineer to qualify for complex road design.
10.1 Traffic signal design involves the design of individual and coordinated traffic signals in smaller signal systems. The prequalified engineer must show they have counted traffic, analyzed signal warrants, know the design of the signal structures, various phasing, detection, interconnect, signal displays, cabling, preemption, signal timing, analysis software, and the various other traffic control devices such as signs and markings; and can coordinate with utility companies.
Traffic impact studies and operational analysis require background in several area, such as: systems planning, traffic data collection traffic forecasting, non-complex and complex traffic capacity analysis, and road and signal design. Mr. Yarger has been active in all of these areas for more than three decades.
Yarger Engineering, Inc. is not prequalified for 2.1 traffic data collection because INDOT requires that the firm own 30 hose counters, which if fine for INDOT’s needs, but way over the number needed for private work. Yarger Engineering, Inc. owns several data collection units, and has even provided traffic data collection sevices to INDOT in the past, but has been moving away from hose counting in favor of 21st century technology using video instead of rubber tubes. Video is much safer and provides more flexibility than rubber hoses. One of the big advantages is that unexplained events on a hose counter can be seen by a human and explained as to a recurring event, such as school letting out or trains, or a non-recurring event such as a car crash. Yarger Engineering, Inc. had one project where they used video and noticed something wasn’t quite right, but it wasn’t obvious even with the video until they remembered that there were three schools within two miles on the roads being studied, and not a single school was seen on the video. It turned out to be fall break! A hose counter wouldn’t have been able to provide enough background to check the validity of the data collected.
Yarger Engineering offers free inital evaluations. Call us at 317-475-1100 or email us to discuss your traffic needs!