How to make car light trails?

[JimmyO]

Well i assume those long exposures are done in "Bulb" and that they used nuetral density filters to really limit the light.

 

[Helen B]

Sensors – CCD or CMOS chips – don't 'overheat' from exposure. Temperature plays no part in it.

Yes, they can overheat with long exposures, and that creates noise. Sensor cooling is an issue, because the temperature of the sensor does play a part in image quality.

Film cameras also had "B" and "T" shutter speed settings.

'Had' is a little premature. They still have them.

Best,
Helen