Two separate sets of problems could have been anticipated. First, the mechanical aspects, such as the construction of the tracks and the operation of the carts, demand precision. If angles and tolerances are not calculated correctly, the carts would either not be read properly or would crash or fly off the tracks. Second, the software required the writing of millions of lines of computer code which were necessary to direct bags safely and correctly to their destination. Software errors would cause telecarts to be misloaded and misdirected, often resulting in spectacular accidents. One such incident was captured by a local television station and broadcast several times to an incredulous public. Needless to say, both kinds of problems recurred.