IoT fleets bring big gains, but they also widen the attack surface. This article looks at how transportation teams can protect connected vehicles and data while still using real-time insights. It explains core safeguards like end-to-end encryption, TLS links, device-level checks, and role-based access. You will also find notes on audits and compliance, plus why monitoring matters after rollout. The second half reviews market trends, from AI-based analytics and autonomous vehicle support to edge computing and emissions tracking.