When snaking the main sewer line, how do you know when you've reached the street connection?
I've done this a few times and I've never been able to "feel" when you hit the street. Maybe someone who does this often acquires more of a feel. I'm at least 50ft from my street, so perhaps it's just because there's a lot of resistance from the 50ft of snake in the line.

The easiest way (other than a camera of course) to know you're at the street is to measure the distance from the edge of your foundation to the street, then add the distance inside plus a few feet to account for it not being perfectly straight and level. If you've gone 70ft when you think it should only be 50ft, my guess is that you're past the street already.  Either that or the markings are wrong.