"inconvenient traffic" is correct and usable in written English.
You can use it to describe a situation in which the traffic conditions are not favorable or easy to deal with. For example, "The inconvenient traffic made it difficult to drive around the city."
It's an inconvenient traffic snarl-up every weekday morning.
The main difficulties village doctors encountered in TB work were a lack of government funding for TB control tasks (28 doctors, 32.9%), inconvenient traffic and distances in mountain areas (19 doctors, 22.4%), low treatment adherence of patients (10 doctors, 11.8%) low education level of patients (6 doctors, 7.1%), and high workload (5 doctors, 5.9%).
Sure, that sounds like fun, but it can get inconvenient in traffic or in the office.
Furthermore, these villages were located a great distance from town which made traffic inconvenient.
In fact, it was so inconvenient that all HTTP traffic to our server was blocked by the network administrators during one of our runs.
In the valleys of the Hengduan Mountains in which the Yi live exist innumerable small areas blocked by the mountains, within which traffic is inconvenient.
How inconvenient is sitting in traffic motionless?
It was sunk in the most inconvenient location possible, blocking all traffic from entering or leaving the naval yard where the Japanese were busy repairing various war craft.
Traffic was relatively inconvenient because the villages were of a great distance away from towns.
However, the Red Cross Society of China said that (on May 13) "it was inconvenient currently due to the traffic problem to the hardest hit areas closest to the epicenter".
The car is also described as inconvenient, due to parking problems and traffic congestion.
