A mobile safety center (MSC) provided education and reduced-cost safety products to low-income urban families. We evaluated uptake of this service under 3 different conditions, and safety-related knowledge and behavior associated with visiting the MSC among 210 families. Utilization varied widely under the 3 different conditions. At follow-up, MSC visitors scored slightly higher on a knowledge test than nonvisitors and improved more in reported car safety seat use, but did not differ in observed safety product use. This study provides very modest evidence of a positive impact of the MSC when its services are provided at a community health center.