3.49噸小貨車為公路運輸最頻繁之車種，當載運貨物之小貨車於隧道中發生火災，將造成極大之危害，本研究進行五次全尺寸實體燃燒試驗，以瞭解3.49噸小貨車載運貨物下之自由空間燃燒行為，並進一步提出改善措施，檢討其效果。
經試驗結果分析，自由空間下3.49噸小貨車燃燒成長期均以t-square火災模式成長，燃燒成長係數α值（MW/s2）會隨著引燃位置與裝載貨物種類不同。裝載木材貨物時，由貨物中心點引燃之α≒0.000163；由駕駛座引燃之α≒0.000036。裝載塑膠貨物時，由於塑膠熔融滴落之燃燒特性，火焰會隨著熔融之液體流動，造成火勢快速蔓延，其α≒0.00021。燃燒後達燃燒高峰期，其最大熱釋放率分別為23.83MW、21.21MW與47.47MW。
利用建築防火區劃概念，將鋼鐵製貨床配合耐火布幕，對小貨車與貨物進行區劃。經由兩次改善試驗結果顯示，不論木材類或塑膠類貨物，引燃後皆為持續悶燒之狀態，未有火焰燒穿之情形，並可降低20%以上之質量損失率，有效抑制火災成長。區劃外之溫度與輻射熱皆未達危險界限值，因此區劃後可有效阻隔貨物燃燒產生之高溫與輻射熱，達到防止延燒之目的。

The 3.49-ton truck is the type of vehicle seen most frequently on highways. Extreme danger occurs when a loaded 3.49-ton truck catches on fire in a tunnel. Five sessions of full-scale burning tests have been conducted in this study in order to understand the burning behavior of a loaded 3.49-ton truck in free space and to provide measures for improvements and examine the results.
The test results show that the “Growth Development Period” in the burning of a 3.49-ton truck grows according to the t-square fire model. The α value (MW/s2) of the burning growth coefficient changes along with the location of ignition and the type of cargo. When the truck is loaded with lumber, α≒0.000163 when the ignition starts at the center of the cargo. α≒0.000036 when ignition is located in the cockpit. When the truck is loaded with plastic, fire spreads out quickly along with the molten liquid due to the characteristic of molten plastic. Its α≒0.00021, and when it reaches the peak, the maximum heat release rates are 23.83MW, 21.21MW, and 47.47MW respectively.
Based on the concept of fire enclosure, we have separated the 3.49-ton truck from its cargo using a steel cargo bed and Fire Curtain. After two improvements, the test results show that the cargo caught on fire, regardless of whether it was wood or plastic. It only maintained its smoldering status and no burning-through was observed. This also reduced mass loss rate by more than 20%, and effectively suppressed the growth of fire. Both the temperature and radiation outside the enclosure did not reach critical levels; therefore, the high temperature and radiation generated in the burning cargo are effectively cut off after partitioning, and the spreading of fire is prevented.

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