Gridlock actually happens in busy intersection when drivers block it. To avoid gridlock, drivers should only proceed through an intersection if there is a way on of it. Gridlock can also happen on a freeway if interchanges are too close together: people using the off-ramps can block people using the on-ramps.
The follow picture is a great example.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgPdxXQ4SCen5rbnX5bUOxIcBdbuGb743oS0QfsqBsPAE_2nEHAptv6c7Ggml_pW395y9K9ZXuy_f27GWQde-6FNev7E6n4A9BZ1ayJWi22IclmqgmIR39UsDboGcAj956LGLY4VtO19y2-/s400/deadlock.jpg)
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