NIGP 55017: Encapsulant, Traffic Loop Detector

NIGP 55017 Encapsulant, Traffic Loop Detector is an Item code covering materials and equipment used to seal, protect, and support inductive loop detection systems embedded in roadway pavement for traffic signal timing and vehicle counting. State and local governments procure loop detector encapsulants as components of broader traffic signal infrastructure projects—resurfacing efforts that include loop detector repair and replacement, new traffic signal installations, and standalone loop detector installation and maintenance work. Issuing bodies soliciting under this code span city transportation and street departments (Atlanta, Madison, Phoenix, Temple), county commissions (Thomas County, Pasco County, Santa Clara County), and transit-oriented development authorities (Atlanta BeltLine). The Atlanta Department of Transportation, City of Madison Traffic Engineering, and City of Phoenix Finance Central Procurement appear multiple times in recent activity, indicating recurring procurement of traffic signal detection equipment as part of ongoing street maintenance and signal upgrade cycles.

Activity concentrates in the Southeast and Midwest, with recent opportunities posted by jurisdictions in Georgia (Atlanta, Thomas County), Florida (Pasco County), Wisconsin (Madison), North Carolina (Charlotte), and California (Santa Clara County). Representative recent solicitations include the City of Atlanta Department of Transportation's IFB for 2025 LMIG Street Resurfacing and Associated Activities Group 3 (response due August 3, 2026), which explicitly includes loop detector repairs as part of 4.32 centerline miles of asphalt resurfacing across three streets; the City of Madison Traffic Engineering's RFB for 12" Signal LED Replacements and Supporting Equipment (response due May 22, 2026), which bundles LED modules with signal poles, backplates, and pedestrian signal bases; and the City of Phoenix Finance Central Procurement's IFB for Loop Detector Installation Services (response due October 17, 2025), covering count and presence detector installation in asphalt and concrete across 42 line items for detector sizes ranging from 6' x 6' to 6' x 70'. Loop detector encapsulants typically appear as line items or embedded specifications within larger traffic signal, pavement, and intersection improvement contracts rather than standalone solicitations.