Methods and apparatus to conduct surveys are disclosed. An example apparatus includes an activity sensor to generate activity information, and a location sensor to generate location information corresponding to a portable device carried by the person. The apparatus further includes a processor to: generate media monitoring information indicative of exposure of the person to at least one of an advertisement or a product; determine a number of exposures the person has had based on the media monitoring information; identify a survey question based on the number of exposures; determine a speed of travel of the person based on at least one of the location information or the activity information; and compare the speed of travel to a threshold. The apparatus also includes a communication interface to automatically offer the survey question via the portable device when the processor determines the speed of travel is beneath the threshold.