Offset turn instruction
Oftentimes at standard, perpendicular intersections, streets dead-end on one side and pick up again on the other side, offset by just a few dozen feet. For simplicity's sake and for routing, we map a lot of these as plain four-way intersections (like an italicized + sign, you could say).
But this can be confusing for drivers, who arrive at the intersection with no special instruction and yet are forced to almost fully turn right or left. The simple four-way mapping style is appropriate when the offset would still allow a car's width to pass through without turning, but when there is no possible straight line from one segment to the next of the same name, an offset turn instruction would be a great upgrade from either no instruction or the right/immediate left instruction sequence.
I imagine this could be done heuristically by having the app identify when the route has two opposite-direction-turns within 50 ft. of each other, or perhaps with a junction box and a custom turn instruction. The instruction could say "Take the offset turn to continue on [X St]" and the displayed icon could resemble a lowercase h without the bottom of the letter's stem.
John M commented
I am not sure what type of instruction I want, but it should be shown visibly in the app.