Before revision:  However, the following questions should be answered regarding how the AV sends the information to them: 1) What timing for the AV to make the pedestrian understand its driving intentions after it is noticed ? 2) What timing for the AV to make the pedestrian feel safe after it is noticed ?
After revision:  However, the following questions should be answered regarding how the AV sends the information to them: 1) What timing for an AV to make the pedestrian understand its driving intentions after it is noticed ? 2) What timing for the AV to make the pedestrian feel safe after it is noticed ?