"The Park Service has marching orders to beef up perimeter security for the Lincoln and Jefferson Memorials, too. On three sides of the Lincoln Memorial, a granite wall nearly three feet high is being raised around the site. The closed roadway on the memorial's Mall side is now ringed by Jersey barriers. Progress has slowly been made to protect the structure from a bomb-laden vehicle approaching alongside the Reflecting Pool or at an angle across the Mall. Bollards will probably be placed at the foot of the steps connecting the roadway to the pool. Cables would be hidden amid new hedges flanking the steps, while bollards would be placed across the roadway. Review boards have been sending the Park Service back to the drawing board to restudy their plan since 2002, and the bollards will be much less conspicuous as a result."
Thanks to Brenda Meyer