With that network of lines, there's no way for ArcGIS to figure out which page you'd like to be "first". The strip map tool is meant to create a mapbook along one line feature, it doesn't do so well with more than one, especially if they crisscross each other like yours do. However, it does look like it covered all of your lines with mapbook pages, and they're oriented more or less correctly. In your situation, I'd just edit the index layer and re-number the pages however you want them to be ordered. If you want to be able to generate the pages automatically, you will probably have better luck using the Grid Index Features tool instead.

With that network of lines, there's no way for ArcGIS to figure out which page you'd like to be "first". The strip map tool is meant to create a mapbook along one line feature, it doesn't do so well with more than one, especially if they crisscross each other like yours do. 

However, it does look like it covered all of your lines with mapbook pages, and they're oriented more or less correctly. In your situation, I'd just edit the index layer and re-number the pages however you want them to be ordered. I would also remove some of the pages, when you have overlapping lines and you use the Strip Map tool, you can get unnecessary pages where your lines meet, because the tool is generating a complete map set for each line feature individually. Pages 24 and 48 in your screenshot, for example, seem to be redundant.

If you want to be able to generate the pages automatically, you will probably have better luck using the Grid Index Features tool instead.

With that network of lines, there's no way for ArcGIS to figure out which page you'd like to be "first". The strip map tool is meant to create a mapbook along one line feature, it doesn't do so well with more than one, especially if the crisscross each other like yours do. However, it does look like it covered all of your lines with mapbook pages, and they're oriented more or less correctly. In your situation, I'd just edit the index layer and re-number the pages however you want them to be ordered. If you want to be able to generate the pages automatically, you will probably have better luck using the Grid Index Features tool instead.

With that network of lines, there's no way for ArcGIS to figure out which page you'd like to be "first". The strip map tool is meant to create a mapbook along one line feature, it doesn't do so well with more than one, especially if they crisscross each other like yours do. However, it does look like it covered all of your lines with mapbook pages, and they're oriented more or less correctly. In your situation, I'd just edit the index layer and re-number the pages however you want them to be ordered. If you want to be able to generate the pages automatically, you will probably have better luck using the Grid Index Features tool instead.