Bonluck vehicles, typically built for commercial use like buses and coaches, have large windshields that demand robust weather resistance due to the extended time spent on the road. In colder climates, these expansive panes are at greater risk for stress cracking due to uneven heating during defrost cycles, especially if heaters are concentrated in small sections rather than evenly distributed. Ice and snow buildup must be cleared gently to avoid putting pressure on specific areas that could compromise the structural integrity. In hot regions, prolonged exposure to UV rays can cause seal degradation, glare-related visibility issues, and even delamination of laminated layers over time. In humid and wet environments, the length of the windshield and high exposure make moisture intrusion a common concern, especially around edges and wiper mounts. Routine inspection, consistent application of protective coatings, and professional-grade cleaning are essential to maintaining safety. For fleet operators, scheduled windshield maintenance should be part of standard service checks to avoid costly repairs and ensure clear visibility for drivers and passengers.