rene marsh reports on the gridlocks both kinds, in traffic and in politics. reporter: this summer, millions of americans hitting the road will cross bridges and roadways in dire need of improvement and repairs. getting to your destination, likely won t be easy. expect traffic jams because decades old bridges and your de likely won t easy. expect traffic jams, because decades-old bridges and roads weren t fwoilt habuilt to handl traffic. if this congress does not act by the end of the summer the highway trust fund will run out. dubbed the transportation fiscal cliff, a federal fund used to repair america s crumbling infrastructures just weeks away from going bankrupt. a potential crisis for commuters considering the american society of civil engineers gives u.s. infrastructure a d plus. and one in nine of the nation s bridges are structurally