General provisions. Crash testing to determine compliance with the requirements of S15 of this standard is conducted as specified in the following paragraphs (a) and (b). (a) Belted test. Place a 49 CFR part 572 subpart O 5th percentile adult female test dummy at each front outboard seating position of a vehicle@ in accordance with the procedures specified in S16.3 of this standard. Impact the vehicle traveling longitudinally forward at any speed@ up to and including 48 km/h (30 mph)@ into a fixed rigid barrier that is perpendicular within a tolerance of ??5 degrees to the line of travel of the vehicle under the applicable conditions of S16.2 of this standard. (b) Unbelted test. Place a 49 CFR part 572 subpart O 5th percentile adult female test dummy at each front outboard seating position of a vehicle@ in accordance with the procedures specified in S16.3 of this standard@ except S16.3.5. Impact the vehicle traveling longitudinally forward at any speed@ from 32 km/h (20 mph) to 40 km/h (25 mph)@ inclusive@ into a fixed rigid barrier that is perpendicular within a tolerance of ??5 degrees to the line of travel of the vehicle under the applicable conditions of S16.2 of this standard.