Clone this repo:
git clone https://github.com/fcce/traffic-zsh-theme.git "$ZSH_CUSTOM/themes/traffic-zsh-theme"
Symlink traffic.zsh-theme to your oh-my-zsh custom themes directory:
ln -s "$ZSH_CUSTOM/themes/traffic-zsh-theme/traffic.zsh-theme" "$ZSH_CUSTOM/themes/traffic.zsh-theme"
Set ZSH_THEME="traffic" in your .zshrc.