Obstacle-Removing Position

Portable/removable barriers, which can include removable crash beams and wedge barriers, are mobile obstacles that can be moved in and out of position on a roadway. For example, a crash beam may be completely removed and stored off-site when it is not needed. An additional example would be wedge barriers that are equipped with wheels that can be removed after the barricade is towed into place. 

The catalyst layers need to be designed to generate high rates of the desired reactions and minimize the amount of catalyst necessary for reaching the required levels of power output. An ideal catalyst layer should maximize the active surface area per unit mass of the electrocatalyst, and minimize the obstacles for reactant transport to the catalyst, for proton transport to exact positions, and for product removal from the cell these requirements entail an extension of the three-phase boundary. In general, individual property specifications should be a compromise between conflicting requirements. The catalyst layer structure should be optimized with respect to the interactions between components, with trade-offs between several effects. 

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