Before 8 a. m., traffic is light, however, at 5 p. m., Fred always wishes that he drove a bulldozer to push other cars out of his way.

The correct sentence is;

''Before 8 a.m., traffic is light; however, at 5 p.m., Fred always wishes that he drove a bulldozer to push other cars out of his way.''

Explanation:

There should be a semicolon after the word light because this joins the two contrasting clauses (one where traffic is light and the other inferring heavy traffic).

The conjunctive adverb, ''however'' is properly used in the sentence to link the two independent clauses.

1.the hosts on two opposing mountains stood,  

2.thick as the foliage of the waving wood;  

3.between them an extensive valley lay,  

4.o'er which the gleaming armour pour'd the day,  

5.when from the camp of the philistine foes,

6. dreadful to view, a mighty warrior rose; in the dire deeds of bleeding battle skill'd,