Proposal concerning assessment of ACSF Category B1 lane keeping systems. Under Annex 8, proposal to delete the warning-to-deactivation cascade testing at high speed because the capability is already demonstrated under the low-speed test and the high-speed variation effectively requires a test track length of more than two kilometers. The proposal would also clarify paragraph 5.6.2.3.1. regarding the use of inputs other than lane markings where lane markings are not present.