Ive made a roundabout for sims entering the city and for the industry trucks to go to there factories although its been clogging up traffic flow rapidly :/ . Any advice? 
Help with making an interchange!!
- Thread starter olivemanwastaken
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Remove the middle red road from the roundabout and let the roundabout take everything.
Are you sure? Before i added the middle part, it would still clog up :/. Ill try your advice asap
or apply some lane mathmaties to the lane drops onto the bridge and where it picks the lnes up again coming off the bridge
Using highway off-ramps on non highway roads never leads to a good time due to the presence of traffic lights as the game treats the junction as a standard intersection, causing terrible traffic snarls.
Either turn the traffic lights off at your junctions using TM;PE, upgrade your 6 lane road to a proper highway system, or tear out that entire section and build something that works.
Either turn the traffic lights off at your junctions using TM;PE, upgrade your 6 lane road to a proper highway system, or tear out that entire section and build something that works.
You don't need TMPE to turn off lights, and highway exits onto main roads work just fine as long as they aren't drawing too much traffic.
You're making a very big basic mistake here.
You are making small neighborhoods that lots of cims have to get in and and out of, and there is only 1 way in or out. Which means everyone has to choose that path with no alternatives. Your roads are sucking in extra traffic for no reason. Your nearby neighbourhoods don't even have connections to each other. Everyone has to get onto a big 6 lane road and then work their way off again for no reason. That's madness. You need to give cims different options to get places that equally attractive. They always choose the fastest road. So when you only have 1 fastest road, that road sucks up all the traffic.
So first off. Roundabouts aren't meant to be catch-alls for all your city's traffic. They are ease to transitions though intersections so you don't have to have a traffic light that brings everything to a halt. If you have a high speed road in your roundabout or even worse a highway, it sucks in all nearby traffic because cims always choose the fastest roads to their location. All the cims are saying "instead of just driving around the corner to the store, I'm going to detour through the roundabout because it's 10x faster".
2 lane roads are 40mph and produce little noise. These are good for housing neighborhoods and making sure that the only people who need to use them choose them. They are the slowest roads and they never draw extra traffic because only the exact people who need to get to a property zoned off them are going to choose them. (Unless there are no other roads.) (industry roads an noisier but cheaper to build). Consider these roads drive-way extenders. They work to move people from their drive-ways onto the 4 lane roads.
4 lane roads are 50mph and produce medium noise. They are good for commercial roads and they collect everyone from their 2 lane roads to move them around the city. Big buildings like schools or factories or whatever should be facing 2 lane roads that turn off of them, and not directly on the 4 lane road, as it slows traffic down when everyone is stopping to turn into them. These roads suck in traffic that needs to get somewhere, and then get them off as quickly as possible.
6 lane roads are 60mph and produce LOTS of noise. More lanes does absolutely nothing unless those lanes go somewhere. A 6 lane road means the left lane is for turning left, the middle lane is for going straight, and the right lane is for turning right. If you don't satisfy all those conditions. so no one is turning left, that lane isn't EVER getting used. Use these sparingly with good reason. Changing lanes takes time and can hold up traffic. Have just 6 lane sections at the intersection to split people who need to turn left away from people who turn left from the people going straight can be a good idea sometimes. But that will produce a noisy intersection.
Highways are fastest and noisiest. They are for getting people to far away places and not to be twisting into all your traffic network. Best left for tourists coming into the city by car, and your industry imports and exports. People making local trips don't usually need to be getting on and off the highway to do so. Just people going across town, and they should be driving a distance to the onramp so it's not too convenient, or you are just sucking all the traffic on to them. If someone takes the highway to get to the stadium on the other side of the map for an event, that's fine and expected. It's for long trips. If someone is weaving on and off the highway to go buy groceries, you are failing catastrophically.
Don't pack one type of zone into 1 area. If all your industry is in one area then every cim who needs to come and go to work has to drive down those roads. All the import / exports have to drive down that road. All the local deliveries also need to use those roads. If all the commercials are in the same spot, same thing. All the deliveries are coming down those roads. All the shoppers are using them. You're packing everyone in. Have small pockets of different zones with multiple ways in and out so everyone can get where they are going.
Not following these rules is how you end up trying to make 15 routes around an overcrowded roundabout and continually making it worse.
You're making a very big basic mistake here.
You are making small neighborhoods that lots of cims have to get in and and out of, and there is only 1 way in or out. Which means everyone has to choose that path with no alternatives. Your roads are sucking in extra traffic for no reason. Your nearby neighbourhoods don't even have connections to each other. Everyone has to get onto a big 6 lane road and then work their way off again for no reason. That's madness. You need to give cims different options to get places that equally attractive. They always choose the fastest road. So when you only have 1 fastest road, that road sucks up all the traffic.
So first off. Roundabouts aren't meant to be catch-alls for all your city's traffic. They are ease to transitions though intersections so you don't have to have a traffic light that brings everything to a halt. If you have a high speed road in your roundabout or even worse a highway, it sucks in all nearby traffic because cims always choose the fastest roads to their location. All the cims are saying "instead of just driving around the corner to the store, I'm going to detour through the roundabout because it's 10x faster".
2 lane roads are 40mph and produce little noise. These are good for housing neighborhoods and making sure that the only people who need to use them choose them. They are the slowest roads and they never draw extra traffic because only the exact people who need to get to a property zoned off them are going to choose them. (Unless there are no other roads.) (industry roads an noisier but cheaper to build). Consider these roads drive-way extenders. They work to move people from their drive-ways onto the 4 lane roads.
4 lane roads are 50mph and produce medium noise. They are good for commercial roads and they collect everyone from their 2 lane roads to move them around the city. Big buildings like schools or factories or whatever should be facing 2 lane roads that turn off of them, and not directly on the 4 lane road, as it slows traffic down when everyone is stopping to turn into them. These roads suck in traffic that needs to get somewhere, and then get them off as quickly as possible.
6 lane roads are 60mph and produce LOTS of noise. More lanes does absolutely nothing unless those lanes go somewhere. A 6 lane road means the left lane is for turning left, the middle lane is for going straight, and the right lane is for turning right. If you don't satisfy all those conditions. so no one is turning left, that lane isn't EVER getting used. Use these sparingly with good reason. Changing lanes takes time and can hold up traffic. Have just 6 lane sections at the intersection to split people who need to turn left away from people who turn left from the people going straight can be a good idea sometimes. But that will produce a noisy intersection.
Highways are fastest and noisiest. They are for getting people to far away places and not to be twisting into all your traffic network. Best left for tourists coming into the city by car, and your industry imports and exports. People making local trips don't usually need to be getting on and off the highway to do so. Just people going across town, and they should be driving a distance to the onramp so it's not too convenient, or you are just sucking all the traffic on to them. If someone takes the highway to get to the stadium on the other side of the map for an event, that's fine and expected. It's for long trips. If someone is weaving on and off the highway to go buy groceries, you are failing catastrophically.
Don't pack one type of zone into 1 area. If all your industry is in one area then every cim who needs to come and go to work has to drive down those roads. All the import / exports have to drive down that road. All the local deliveries also need to use those roads. If all the commercials are in the same spot, same thing. All the deliveries are coming down those roads. All the shoppers are using them. You're packing everyone in. Have small pockets of different zones with multiple ways in and out so everyone can get where they are going.
Not following these rules is how you end up trying to make 15 routes around an overcrowded roundabout and continually making it worse.