number lines with bold arrow in the middle

[Julie Sumwalt]

I know how to do number lines, but how should I handle the arrowhead in the bolded segment of these number lines?

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[Lindy Walton]

Hi Julie. I can't say I have ever seen a number line like these, where there is an additional arrowhead printed on the line. Does anyone else have experience with these?

Since distinctive coordinate markers which are superposed on a number line are moved to the line above, directly over the scale marks they cover, I suggest brailling a one-cell arrowhead (right- or left- pointing) above the appropriate location as you would any of the other markers we are given in TG 6.5.1.4.

[togilby]

I've encountered the same situation; an arrowhead indicating the end of the bold segment within the boundaries of the number line.
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Thank you, Julie and Lindy

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