I have 4 distinct questions (which I have numbered for convenience).
<li style="font-weight: 400;">Does the number line begin in cell 1 or is it dependent on the context/exercise material? For Example, would the number line in the attached problem begin in cell 1 or cell 3 (for the runover)?
<li style="font-weight: 400;">Can a number line be placed in numeric passage mode to reduce the length/keep on the same braille line?
<li style="font-weight: 400;">Is there a required number of horizontal line indicators between an arrow or a crossing vertical line?
What do we do when a number line requires multiple braille lines? (Example, if we have a -40 to 40 number line where we need to be able to see every tick.) Sometimes we can get it to fit as a graphic, but I've seen a lot of number lines that are too big for a horizontal or a vertical graphic to work.