Spidey Sense
Built at Meta Global AI Developer Hackathon · Oct 26, 2026 · Remote

Kavacham turns 90 seconds of phone video from a foot-overbridge into a junction-risk report so municipalities can build safety infra BEFORE crash, not after. Problem: In India, Nairobi, Jakarta, Mexico City, junctions are unplanned and safety infra is built only AFTER a fatal crash. We have no low-cost way to audit risk. Solution: Film 90 sec on any phone. Kavacham auto-reduces 700MB 4K 60fps to 22MB 720p 10fps CRF 18 Lanczos sharp (one-time download to verify quality), tracks EVERY road user with SAM 3.1 chunked 100 frames + 2 tiles 1440x1408 (32 cap) + stitching across chunk boundaries - 90 tracks 93 IDs 20 sec 10,523 detections (27 ped, 27 bike, 20 auto, 16 car) perfect no missing - major role. Geometry flags pairs <80px TTC<2.5s = 148 potential (135 close pass +13 ped crossing) Types auto/two-wheeler 28 auto/ped 25 ped/two-wheeler 21. Llama 4 Maverick verifies top 20 TTC sorted with RED TARGET1 GREEN TARGET2 + gap readout - Finds 1 real near-miss Conflict #70 Motorcycle #73 vs Scooter #83 closing 72px->24px 3px clearance TTC 1.37s Severity 6/6 at centre x435 y812 HIGH zone 68 potential. Individual tracking shows RED #73 GREEN #83 trajectory. Safety Report PDF very detailed for officer + individual: Existing problems, every possible 148 explained, types pie chart, flowcharts close pass 72px->24px, how to avoid (wait 30px gap, use zebra), preventive measures infra building Lane marking white 100m Rs.15k fixes 15 bike-bike 30%, Zebra+Speed breaker+Refuge barricade Rs.25k+8k fixes 46 ped 40%, Convex mirror Rs.5k + Rumble Rs.8k fixes 45 Right. Perfect plan Total Rs.53k 1 week reduces 148->100 30% eliminates #70 type. Animated Video 21 sec HD 1280x720 uses ONLY your uploaded junction real frame hotspot_real.png not generic AI illustration - 7 steps Before dangerous, Lane marking, Zebra+Breaker, Refuge, Mirror+Rumble, Final safe all fixes, Efficiency chart - View + Download like document. Risk zones overlay on YOUR junction: RED Centre HIGH 68 1 real #70 circled, YELLOW Right MEDIUM 45, GREEN Left LOW 35 - Not generic. Q&A Chatbot right side free space visible only after report generation: Voice or typed Hindi Tamil Telugu Kannada Malayalam Bengali English - Meta Voice Transcribe + Llama