High frame rate cameras are intended for slow motion capture and serve no useful purpose for dash cams. Shutter speed will be far more effective in capturing plate numbers than frame rate. Generally speaking 60 fps is considered the top end for "normal"
video capture with speeds of 120 fps and above more suited to
slow motion video. Even high end cameras costing many thousands of dollars make the distinction between "video modes" and "slow motion modes".
That being said, improvements in technology are bringing the price of high frame rate - high resolution cameras down dramatically. Performance that at one time cost many tens of thousands of dollars is now available for a few thousand dollars.
Soon action cam style cameras that can shoot at extraordinarily high frame rates will be entering the market that cost less than $1000.
Sony is set to release the new RXO on October 17th, a rather amazing 4K action camera, especially considering the price. $699.99 USD!
Video Mode - 1080p @ 60fps
Slow Motion Mode up to 1000 fps @ 1920 x 1080p! Shutter speeds up to 1/32000 per second
. One inch Exmor RS sensor!
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"The lightweight Sony RX0 Ultra-Compact Camera offers professional image quality in an action camera–sized form factor. Capable of outputting uncompressed 4K UHD video, it also records up to 1080p60 in-camera at 50 Mb/s in XAVC. A Zeiss 24mm-equivalent f/4.0 lens provides a wide, but not distorted, field-of-view. Its 21MP 1" stacked Exmor RS CMOS sensor produces minimal rolling-shutter artifacts, and is protected by the RX0's waterproof, crushproof, and shockproof body. Use the versatile, diminutive RX0 as a single camera that fits almost anywhere, or for multi-camera recording, timecode-sync up to five cameras. When connected to a Wi-Fi router, greater than five cameras can be synced, suiting the RX0 for concerts, stunts, and other multi-camera applications."
"A 1" Exmor RS CMOS sensor provides extended dynamic range and high-speed readout, even at super-slow motion rates of up to 960/1000 fps. This anti-distortion shutter features speeds up to 1/32000 per second, capable of freezing the action with minimal skew."
Sensor 1 x 1" CMOS
Backside Illumination Yes
Color Filter Bayer
Pixel Gross 21 MP
Effective Pixels 15.3 MP (Video)
Optics
Focal Length 7.7mm
35mm-Equivalent Focal Length 24 - Zeiss Tessar
Maximum Aperture f/4
Lens Elements 6
Minimum Focusing Distance 20.0" / 50.8 cm
Manual and auto-focus modes!
Recording
System NTSC/PAL
Recording Media microSD/HC/XC
Video Format
1920 x 1080p at 24, 25, 30, 50, 60 fps (50 Mbps XAVC S)
Slow Motion Mode
1000 fps Recorded at 1920 x 1080p
960 fps Recorded at 1920 x 1080p
500 fps Recorded at 1920 x 1080p
480 fps Recorded at 1920 x 1080p
250 fps Recorded at 1920 x 1080p
240 fps Recorded at 1920 x 1080p
Still Image Resolution RAW: 21 Megapixel
JPEG: 21 Megapixel
Waterproof down to 33'
https://www.sony.com/electronics/cyber-shot-compact-cameras/dsc-rx0