One Vehicle: With and Without Expedient Means

Q: Is the doctrine of the One Vehicle in this Lotus Sutra and the doctrine of the One Vehicle in the Avataṃsaka Sūtra, the Śrimālādevi Sūtra, and so forth, the same or different?

A: The term is the same but the meaning is different.

Q: What do you mean [when you say] that the meaning is different?

A: The doctrine of the One Vehicle in the Avataṃsaka Sūtra, the Śrimālādevi Sūtra, and so forth, contains expedient means; but the doctrine of the One Vehicle in the Lotus Sutra rejects all expedient means. Therefore one can perceive that the meaning is different.
Q: What is the meaning of “containing expedient means” and “rejecting expedient means”?
A: In one the three [vehicles] exist outside [the One Vehicle]; therefore it contains expedient means. In the other the three do not exist outside, therefore it is said to reject [expedient means].

Tendai Lotus School Teachings, p 59-60