Spanish to English Law/Patents Law (general) police report - description of scene of crime

This is from a police report from Spain describing the road where an accident occurred. The road bordered by orange groves on one side and is described as "careciendo de proteccion alguna" which I understood to mean that there is no fence/barrier. The next paragraph says

"El linde del camino con el campo de naranjos lo forma un muro de doble bloque por su construccion con estas piezas de forma transversal, finalizando sobre el nivel de marcha por el camino a 20 centimetros formando una especie de bordillo..."

The accompanying photograph is too blurred to be of any help!

My translation so far "the boundary between the road and the orange groves is formed by a wall of double blocks ..."

Any help greatly appreciated!