I must say that the signage on that section from Cementon to White Haven is excellent. As with any trail, the D&L has to leave the woods from time to time and I had no trouble staying on course. They've done a good job. I've not been on the road section between Northampton and Allentown. But I'd be surprised if that was not well signed too.
I also would not be surprised if the signage north of White Haven gets sketchy as those sections are less developed. Hopefully someone else has been up there recently. My barber, who is almost 90, said he had been as far as Moosehead Lake and had no trouble.
FYI, I was surprised to discover that there is camping near mile 95, Bowmanstown in Riverview park. It appears to be operated by the borough of Bowmanstown. Find their website for info, phone number and a wee bit of info.
Update on the D&L trail maps: the trail connection across the Lehigh river at Jim Thorpe was opened last fall - the Mansion House Bridge. Beautifully done! No road sections from Weissport to JT. All trail, along the old Lehigh canal. Yahoo.