This modern tank trailer was built according to the latest findings in regards to safety measures. TOPAS stands for Tank vehicle with optimal passive and active safety installations. These include: ABS, low gravity-center, high-positioned break lights and chassis protection built in aerodynamic shape. The tank has elliptic double wedge shape and for weight reasons is built of light metals. In the future, because of their highly inflammable payload, most tank trailers will be built in similar shape.