GLMZ's physical economy runs on the backs of autonomous surface freight crawlers—heavy, low-profile electric platforms that operate continuously across the city's sub-street logistics network, a labyrinthine system of service corridors, underground access tunnels, and designated surface lanes that most residents never see. Crawlers range in scale from 200-kilogram last-meter delivery units to 12-tonne heavy freight platforms capable of transporting prefabricated construction modules or industrial chemical shipments. All classes operate without human operators aboard, coordinated by the Meridian Logistics Exchange, a distributed AI traffic management system maintained under a consortium agreement between eight major corporate logistics providers.

The crawler platforms themselves use LiDAR arrays, millimeter-wave radar, and passive infrared for environmental sensing, supplemented by continuous V2X communication with embedded road infrastructure—smart pavement segments that relay surface condition, congestion density, and hazard status in real time. Navigation is handled by a layered autonomy stack: a global route planner operated at the Exchange level assigns corridor paths, while onboard edge processors manage reactive obstacle avoidance and micro-routing. Crawlers do not make independent routing decisions above the tactical level; all strategic movement is logged, audited, and subject to corporate priority weighting, meaning shipments flagged by Tier 1 corporate clients automatically preempt lower-priority loads at contested corridor junctions.

The logistics network has an officially invisible and an officially invisible informal shadow. Registered crawlers carry corporate transponder codes and travel documented corridors, but a significant secondary economy of unregistered or spoofed-transponder platforms operates in the deeper sub-street tunnels, moving goods that do not survive documentation—contraband pharmaceuticals, unlicensed hardware modifications, black-market protein stocks, and the physical infrastructure of organizations that prefer not to exist in any database. These rogue crawlers use stripped autonomy stacks with offline navigation maps updated through peer-to-peer encrypted mesh networks, and their existence is openly acknowledged by street-level enforcement agencies despite a persistent inability to suppress them. The tunnel geography is simply too extensive and too poorly mapped for systematic interdiction.

Labor displacement caused by crawler proliferation is among the most politically charged infrastructure issues in GLMZ. The transition from human-operated surface freight vehicles to autonomous platforms between 2141 and 2158 eliminated approximately 340,000 registered logistics jobs across the city's formal economy, a figure contested by corporate interests who argue that crawler maintenance, software auditing, and Exchange operations created offsetting employment. Independent labor economists place the net displacement figure at between 180,000 and 220,000 positions, concentrated overwhelmingly in Districts 5 through 9. Former freight workers who lacked the technical credentials to transition into crawler maintenance roles represent a disproportionate share of the city's unhoused and informal-economy populations, a correlation that remains politically inconvenient for the logistics consortium and largely absent from its public communications.