"Any lesser conditions contained in any Supplement, Rider or Addendum shall be superseded by the conditions contained in this Master Agreement. However, except where specifically stated otherwise in the Master Agreement, nothing in this Master Agreement shall deprive any employee of any superior benefit contained in their Supplement, Rider or Addendum."
http://teamster.org/sites/teamster.org/files/6161478090_master_final.pdf
Tons of this exact language in many sections of the National Master:
"This paragraph supersedes any provision in any Supplement, Rider or Addendum which addresses this subject."
Which would be "specifically stating otherwise" that local riders and supplements don't apply.