In the city where I live, the main street is depicted on maps as running exactly north/south, and its main cross street is depicted as running exactly east/west. However, in reality, the north/south street runs on a different angle, as does the east/west cross street. I'm assuming on our city touristy and transit maps this is done to make it them easier to understand, whereas on the detailed road maps "true" angles are depicted. (A similar principle, Gis software in my vehicle allows me to set it so that whatever direction I'm driving in is straight up (and down) on the 2d map, or I can set it so that it shows me driving at whatever angle is the road's true gis coordinates)
My question is, is there a name for the type of map, or the principle behind creating those types of map, that depict the main streets as running exactly north/south east/west (as the case may be), or conversely, is there a name for the maps that depict "true" angles of the streets? (please include information about how cartographers describe the differences between these two types of map).
(note, I've seen several websites that list 5 or 6 principles of map making but none of them refer to this concept/idea explicitly, although I assume it falls under the general principle of Legibility, which is one of the 5 key principles of map making)