What is relay racer (aka roadrunner) behavior?

Roadrunner or relay-racer behavior includes:

1. Start on a task as soon as you have the input.

2. Work 100% on the task.

3. Turn the task output in as soon as it is available.

It also includes the run-rules so each resource can decide which task to work on next. These rules are:

4. Highest priority project first.

5. Higher priority to tasks on critical chain.

6. For equal tasks, higher priority to one with greatest percent of buffer penetration.