Hi, 

I am still a bit uncomfortable with the message of the use case 3.3 where pedestrians or cyclists need to carry a mobile phone to avoid being knocked down by a car - at least that is how I read it. 

The reason is that, in many places, drivers are not paying enough attention to pedestrians and cyclists - even considering their presence on the road as an aggression. As a rebound effect your application that aims at providing more security for the vulnerable pedestrian or cyclist, is likely to result in walking/cycling being more dangerous. Drivers may rely on that application to detect the presence of pedestrians and cyclists and defer the responsibility of being knocked down to the pedestrian or cyclist wearing this application. This is problematic as drivers will likely be even less careful toward pedestrians and cyclists which increases the most vulnerable persons (here I am thinking of kids) as they do not have such mobile phones.
 
For this reason, I do not think the use case is neither appropriate, nor convincing. The use case sounded to me a bit like the "IPv6 fridge". I would rather consider such use case more appropriate for specific environments such as construction sites where everyone may be required to carry such applications. My recommendation would be to reformulate the use case for these environments. This probably requires very minor changes in the text. 

That said, I let you decide what to do with it, as it might also reflect a personal view, and I do not want to slow the publication of document. Feel free to let me know, if you need more information. 

Yours, 
Daniel  


   """
   For Vehicle-to-Pedestrian (V2P), a vehicle can directly communicate
   with a pedestrian's smartphone by V2X without IP-RSU relaying.
   Light-weight mobile nodes such as bicycles may also communicate
   directly with a vehicle for collision avoidance using V2V.  Note that
   it is true that a pedestrian or a cyclist may have a higher risk of
   being hit by a vehicle if they are not with a smartphone in the
   current setting. """