AFAIK:
Camera sensor Sony EXMOR 1/2.3” (diagonal 7.81mm, 6.16 x 4.62mm)
Effective pixels: 4072 × 3046 = 12.40 M (total pixels: 4168 × 3062 = 12.76 M, active pixels: 4024 × 3036 = 12.22 M)
Lens FOV 94°, focal length 3.61mm (or 20mm @ 35mm format equivalent) f/2.8
ISO Range 100-3200 (video) 100-1600 (photo)
Electronic Shutter Speed 8s - 1/8000s
Image Max. Size 4000 × 3000
Video Recording Modes:
UHD: 4096 × 2160p 24/25, 3840 × 2160p24/25/30
FHD: 1920 × 1080p 24/25/30/48/50/60
HD: 1280 × 720p 24/25/30/48/50/60
Max. Bitrate Of Video Storage 60 Mbps
...so the image sensor resolution is somewhat vague. The OP wasn't quite clear if s/he was doing images or video and in which settings ... OP wanted 15 mph which is about 50% of P3P max speed but didn't mention lighting, ISO, shutter speed which contribute to image blur...