If the have the typical 10 kw day 1 kw night expanded AM band licence and the clock or PC that controls the transmitter is messed up you could have 10 kw at night on a relatively clean channel. The coverage could be impressive.
Uh no. It's not a regular broadcast station. It's what we think of being classed as a travelers information station or highway advisory radio station. those typicallly have 10 watts but some have had STA or regular licenses for up to 100 watts