dude,
a lot of wisdom from those who replied.
Still best if you leave that at home. If your assailant(s) find you with a club, they will only increase their will to "hurt" you bad. Worse...if so happen a policeman passes by and see you holding a club, you will be charged. Takkan you say, you want to practise your golf in the middle of a busy highway.
Best strategy is to ignore foolish people (road bullies) and in case of a robbery, remember you can always buy another car but you only have 1 life to live.
Thus...the need for golf club?
cheers dude!
happy driving,
s-c
*you deserve it, if you have worked hard for it*