LOS ANGELES—California Highway Patrol officials say a stunt where bikers blocked traffic on Interstate 10 east of Los Angeles for a marriage proposal may result in serious charges, and numerous traffic citations have already been issued.

Officer Vince Ramirez said Tuesday that investigators will now determine if the proposal resulted in violations worthy of felonies, such as accidents that may have caused injuries.

In videos posted to YouTube, hundreds of motorcyclists block four lanes of traffic and an off-ramp Sunday afternoon while the would-be groom burns out a "smoke bomb" tire that lets off a huge plume of pink smoke.

A man wearing a leather vests with the Subliminal 710 Bikerz insignia then got down on one knee and proposed to his girlfriend before the bikers rode away.

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Online:

http://www.youtube.com/watch?viBusIjxK5H4