The Bush administration indicated on Friday that it is looking for ways to roll back rules approved by the Clinton administration to ban road-building and logging on a third of the country’s national forests. In one of his first acts in office, President Bush put off the date the rules would come into effect until 12 May, and in a court motion filed on Friday, the administration offered to postpone that date still further, probably until at least early summer. The motion effectively granted a request by the timber behemoth Boise Cascade, which had asked a federal judge to issue an injunction preventing the rules from taking effect.