Discription of Events: White pickup, company vehicle.\r\n\r\nTook personal offense to being merged in front of before they had a chance to accelerate to cut off merger. Followed for miles and made great effort to get in front of merging driver afterwards. Brake checked, slowed well below speed limit when passing was not possible, weaved between lanes to prevent safe passing. Only relented when other driver merged into slow lane of traffic apparently travelling too slow for this driver\'s patience.