1 x 134, 2 x 67
If you take I95 and US222, you can get there without paying tolls. It's two miles less and only four minutes longer than the toll route. Go I40 to I440 to US64E. Take I95 north through Virginia. Take I295 north around Richmond. Take the I395/I95 Connector North exit. Take I495 into Maryland. Take US29 north to I70 east. Take I695 north to I83 north. From I83 north, take the exit for PA 462 west. It takes you into Allentown.
Have a look here: http://i83.photobucket.com/albums/j293/airjer/AF%20Stuff/sunfirehl.jpg I'm not sure exactly what model year this is for, but it should be representative.
Generally speaking, North to South use odd numbers. East to West use even numbers.