![]() For example, you won’t be using Warrant 5, School Crossing, if there’s not a school in the immediate area. It’s also a good idea to check with the governing agency to see if all warrants are equal in their eyes. For instance, the Minnesota Department of Transportation looks to Warrant 1 to be met before a traffic signal is installed. ![]() The three primary pieces of data to collect when evaluating traffic signal warrants are: layout of intersection (existing or future), speed limits, and volumes (we like to include turning movements, pedestrians, cyclists, etc.). ![]() Other relevant data to collect includes crash data, progression of other signals in corridor and proximity to schools, parks or other high-pedestrian areas. With this information, the warrants are fairly straight forward. Use the 85 th percentile speed instead of the posted speed limit (check out our article 85 th Percentile Speed Explained).With practicality and efficiency in mind, we’ve put together some tips and tricks to consider when evaluating the traffic signal warrants: Examine the thresholds, compare against the information and data you’ve gathered, determine if the threshold is met and the warrant is satisfied. Last, but not least, use our Traffic Signal Warrant Analysis tool to assist you with accurately analyzing your data and warrants.In a situation where you have a significant number of left turn movements from an approach, you could look at those left turns as your minor leg and the conflicting thru volume as the major leg.In many states, if you have right turn lanes at an intersection, you can remove the right turning lane volume and discount the right turn lane from the total number of approach lanes.Where there is no indication as to which is the major or minor road at an intersection, run your analysis both ways to get a clearer picture.Bicyclists can be counted as either pedestrians or vehicles in your analysis. Warrants are great guidelines for determining whether an intersection justifies the installation or improvement of a traffic signal. Want more information on traffic signal warrants? Check out these tools: While they are no substitute for your expertise and judgement as a traffic engineer, they are an extremely useful way to help you determine the next course of action based on the data you’ve collected.
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