IHS Inc. will be closing its acquisition of RL Polk & Co. faster than expected. The buyer has been granted early termination of the usual waiting period under the Hart-Scott-Rodino Antitrust Improvements Act of 1976; the acquisition is expected to close during the week of July 15 if the customer closing conditions are met. IHS plans to play a dominating role in automotive information and analytics solutions as it integrates Polk and Carfax.