Leveraging Advanced Data to Deliver Multimodal Safety (LADDMS)
Expand Nashville’s LIDAR safety network and provide support for data analysis.
In Partnership with NDOT, TSU, UT Chattanooga
This project is part of a strong partnership with Nashville Department of Transportation and Multimodal Infrastructure (NDOT), who leads the USDOT Stage 1 and Stage 2 SMART Grants. Additional partners include Tennessee State University, and UT Chattanooga.
A video describing the technology used, and the partnership are below. The official project website is at https://ndot-laddms.org.
The documentary video is available here.
Where to find data from this project?
An open-source dataset is available from this github link, which was released as part of a paper at IEEE ITSC 2025.
This paper describes the persistent monitoring of a transportation corridor over the course of 120 uninterrupted days in Nashville, TN. The goal of this monitoring is to provide opportunities to design interventions for unsafe intersections, better understand traffic dynamics, and explore the potential for closed-loop control of vehicle signals and walk signs. The monitoring consisted of mounted lidar units with some overlapping, and some non-overlapping, fields of view, offering coverage of eight intersections across a span of two miles. Lidar provides a sensing modality that is becoming comparable with vision-based approaches in terms of cost. Unlike camera-based sensing, lidar is natively privacy preserving. This provides an opportunity for improved reception in communities. The paper provides a full description of the corridor, the types of classifications performed by each lidar installation, and the refresh rates and data types recorded. In addition, sample analyses are given to demonstrate the richness of the data. Sample results include hot spots for post-encroachment times between classified objects, daily turning count statistical analysis, and event heat maps such as out of crosswalk.
The github link also includes information on how to download the data from the Box link included there.
Source of Support: USDOT/NDOT Total Budget: $1,800,000 Performance Period: 2025/12 – 03/2028 Primary Place of Performance: Vanderbilt University, Nashville, TN
