The land to the north of the Gila River, in United States territory, was too mountainous. President Pierce instructed the American minister to Mexico, James Gadsden, to purchase as much territory in northern Mexico as possible.
A bollard is a short post designed to identify or segment a location, guide traffic or protect sensitive areas. It provides an effective visual barrier for vehicles and pedestrians and can offer significant impact protection where effective security is required.
A bell bollard is a style of bollard designed to deflect vehicle tires. The wheel mounts the lower part of the bollard and is deflected by its increasing slope. Such bollards are effective against heavy goods vehicles that may damage or destroy conventional bollards or other types of street furniture. A variant on the bell bollard is the Martello bollard, its sloped shape inspired by the profile of historic Martello towers. Removable bollards Bollards may be hinged at ground level, allowing them to be folded flat to permit vehicles to drive over them.