▁of ▁Parliament ▁in ▁ 1 9 5 2 , ▁ 1 9 8 0 ▁and ▁ 1 9 8 6 . ▁A ▁to ll ▁of ▁£ 0 . 5 0 ▁has ▁been ▁lev ied ▁on ▁vehicles ▁since ▁ 2 0 0 7 , ▁but ▁the ▁£ 0 . 0 5 ▁to ll ▁that ▁the ▁Act ▁allows ▁for ▁cycl ists ▁or ▁ped est ri ans ▁is ▁not ▁collected . ▁Human ▁to ll ▁collect ors ▁were ▁replaced ▁by ▁autom ated ▁machines ▁in ▁ 1 9 7 5 . ▁The ▁to ll s ▁are ▁used ▁to ▁pay ▁for ▁the ▁up keep ▁of ▁the ▁bridge , ▁including ▁the ▁strength ening ▁of ▁the ▁chain ▁anchor ▁points , ▁which ▁was ▁done ▁in ▁ 1 9 2 5 ▁and ▁ 1 9 3 9 , ▁and ▁regular ▁painting ▁and ▁maintenance , ▁which ▁is ▁carried ▁out ▁from ▁a ▁motor ised ▁cr ad le ▁sl ung ▁beneath ▁the ▁deck . ▁By ▁ 2 0 0 8 ▁over ▁ 4 ▁million ▁vehicles ▁crossed ▁the ▁bridge ▁each ▁year . ▁In ▁February ▁ 2 0 1 2 , ▁the ▁bridge ▁trust ees ▁applied ▁to ▁the ▁Department ▁for ▁Transport ▁to ▁increase ▁the ▁to ll ▁to ▁£ 1 , ▁subsequently ▁implemented ▁on ▁ 2 4 ▁April ▁ 2 0 1 4 . ▁ ▁On ▁ 1 ▁April ▁ 1 9 7 9 , ▁the ▁first ▁modern ▁b unge e ▁j umps ▁were ▁made ▁from ▁the ▁bridge ▁by ▁members ▁of ▁the ▁University ▁of ▁Oxford ▁D anger ous ▁Sports ▁Club . ▁In ▁ 2 0 0 3 ▁and ▁