Planning Commission 02/07/2024 - Feb 07, 2024
meeting
Prince William County Planning Commission
8h 0m
5 speakers
8 agenda items
transcribed 1 day ago
official recording ↗
Transcript
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Transcript generated automatically by AI and may contain errors.
What is a Traffic Impact Analysis (TIA) and why is it required?
primarily in charge of reviewing site plans and subdivision plans so following a rezoning or special use permit this is the team that would be reviewing the site plan for that development or a buy right development that comes in that didn't go through the entitlement process they would be reviewing that site plan to make sure that it meets the county standards and adheres to the proffers or conditions that were established during the SUP or rezoning process So I'll go into a little bit more detail on each of those key items that I discussed, starting with the traffic impact analysis. A TIA, as we sometimes refer to it, or a TIS, a traffic impact study, really is a study which focuses on analyzing the potential impact of a proposed development.
accomplishes that by establishing an existing conditions for the surrounding road network at a site-specific level, meaning it's looking at the roads that have frontage on the site, where their access points are to the surrounding road network, and then nearby intersections. Every single TIA is analyzed and scoped prior to being submitted with an application. We do that in consultation with both us and VDOT, and we establish the criteria or the assumptions that should be included in that TIA for review. That includes a distribution, so where are the trips to the site coming from, where are they going, and how we anticipate that would interact with the surrounding road network. And it also includes a assumption of a percentage of regional growth from the current year out to the build out year of the proposed development.
The outcome of this study really is looking at the build out year with the proposed development, how that's gonna impact the surrounding road network, and the important part is it includes recommendations for mitigation strategies on how we can address any issues that may come up with this proposed development coming into the network. All development applications are required to submit either a TIA scoping form or a TIA deferral form. The reason for this is that traffic impact studies are complicated, they're expensive, and typically most developers need to engage in a traffic engineering consultant to actually, that focuses on conducting these studies to do them. And if a proposed development is not anticipated to substantially impact the surrounding road network, that level of study isn't necessarily warranted or required.
We offer the capability and we evaluate TIA deferral request forms to assess whether or not the TIA is warranted or not at the beginning of development applications. So we participate in the pre-application meetings that the planning office hosts and we get input from the developer about how many trips are proposed to be generated by their development. We utilize a industry standard which is the Institution of Transportation Engineers Their 11th edition trip generation manual outlines how to project potential trips that would be generated from a site. That's done by collecting case studies and different types of land use categories and land uses. And then they create a linear curve and apply a variable so that you can apply it to any type of site that you would be looking at.
So an example of that in practice would be a multifamily development with 200 units, we can look at their fit it curve for multi-family development and we can see where 200 units and what the trip generation would be on that scale. So that's the primary factor that we use in considering if a TIA is warranted or not, but there are other factors as well. We take safety in consideration and the DCSM establishes thresholds for when we find it is appropriate. So the threshold is 1,200 vehicle trips per day or 100 a.m. and p.m. peak hour trips. And as I said, the director of transportation, if he deems it appropriate or we think that there's a safety consideration or maybe there's something else happening in the background that we still think a study would be warranted and needed and useful, then we can request that regardless of whether they meet the thresholds outlined in the DCSM.
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Agenda
8 items
1
What is a Traffic Impact Analysis (TIA) and why is it required?
0:00–1:01:08
2
How does the Design and Construction Standards Manual (DCSM) address parking and bike‑rack requirements?
1:01:08–1:41:04
3
What are the procedures and outcomes of the public facility review and public hearing?
1:41:04–2:36:41
4
What are the concerns about school capacity and traffic from the new residential developments?
2:36:41–3:10:57
5
How do environmental, storm‑water, tree‑preservation and buffering issues affect the project design?
3:10:57–4:01:51
6
What is the Parsons Business Park proffer amendment and how does it address data‑center, height and utility requirements?
4:01:51–5:11:04
7
What buffering and environmental constraints are staff recommending for the Parsons Business Park rezoning?
5:11:04–5:47:19
8
How do community members voice concerns about data‑center impacts, noise, and site layout?
5:47:19–6:59:24
Speakers
5 identified
Michael Sherman 47 min
Christopher Carroll 42 min
Mark Scheufler 9 min
Qwendolyn N. Brown 4 min
Raheel Sheikh 3 min
Officials recognised by voice; public commenters shown as “Speaker N” unless they state their name.