Hi,
When I open this map I do not see any layers contained that give any descriptions of 'streets' or 'highways'. My guess would be that it has been updated and they do not exist as layers anymore.
Did you create this application or did someone else? I suggest to consult with the creator of this application for details on the disappearance of those specific layers, but to me it looks like they are just not included anymore as everything else within the map seems to be working fine!
Matt