On Sat, 21 Aug 2004 19:48:26 -0400, "Morgans"
wrote:

A trick here is, if you are given clearance to taxi to 31, but have to get
to the opposite side of 31 to get to the taxiway that will take you to the
departure end of 31, you may cross any other runways, but may not cross 31
without clearance.

That would only be the case if Rwy 31 were your assigned takeoff runway.
The paragraph I quoted (paragraph 6) had to do with clearances to OTHER
than an assigned take-off runway.

For clearances to an assigned takeoff runway see paragraph 5 which clearly
states the point you are making with regard to taxiing to an assigned
takeoff runway:

=====================================
AIM 4-3-18. Taxiing

5. When ATC clears an aircraft to "taxi to" an assigned takeoff runway, the
absence of holding instructions authorizes the aircraft to "cross" all
runways which the taxi route intersects except the assigned takeoff runway.
IT DOES NOT INCLUDE AUTHORIZATION TO "TAXI ONTO" OR "CROSS" THE ASSIGNED
TAKEOFF RUNWAY AT ANY POINT.
====================================

(emphasis mine)
--ron