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The present paper addresses the performance of the λ type enforcement braking device (EBD) aimed to prevent traffic accidents in a road construction region. Our research concerns the EBD-mechanism installed in the road works area with the traffic-lane regulation. Here we contend that the employment of the discussed device leads to a significant increase of the drivers’, pedestrians’ and workers’ safety protection. The presented evaluation of breaking characteristics and further optimization of EBD structure reveals the effect of the tool’s performance improvement on the collision safety and reliability of the proposed solution. In this study, a particular attention is given to the role of the mast on the EBD’s operation, while our previous papers 6, 7) elaborated the influence of the arm-shape, arm-length and the connecting height of the arm for the mast on braking properties. A simple model collision tests and theoretical calculations based on the conservation law of energy and momentum were employed in our study. The obtained results enabled us to disregard that possible effect of the arm shape and conclude that the use of the long arm and higher connecting height are effective for the shortening of the braking distance, which constitutes the significant extension of our previous studies. The collision tests carried out with three different velocities and the EBD model with extended arm lengths was employed. We arrived to a proper structure optimization by careful examinations of the influence of the mast angle in the λ-type long arm EBD on the braking characteristics. [ABSTRACT FROM AUTHOR]