Cities XXL Why everywhere traffic lights?

That is just the way roads are. There may be a mod that reduces signals.

Citizens will travel anywhere on the same map regardless of distance, providing that your transportation network allows/motivates them to and there are jobs to attract them.

 

Intersecting roads creates intersections, aka traffic lights. Roundabouts can eliminate traffic lights but, they should be used strategically as many times they can be more work than they're worth, and even create larger traffic problems. Unlike in other games *cough cough Cities Skylines cough cough* traffic lights don't cause many issues. You moreso need to focus on using the right sized roads, efficient public transportation, and a well thought-out road network. Pay attention to the road's "cars per minute" limit; if your road says it has heavy traffic and you have a large road (small avenue, large avenue, highways, etc...) the issue may lie in your connections from one zone to another. Like your entire residential block being funneled into one small avenue through one connection by a normal road, will cause issues. If that doesn't seem to be the case, then chances are its a road-size issue.

I know you didn't ask for a mini traffic tutorial but seeing as you asked about traffic lights and you're new to the game, I figured it couldn't hurt