EMB ERJ 145 ER/LR
Confusion
Inflight Event / Encounter CFTT / CFIT
Flight Crew FLC complied w / Automation / Advisory; Flight Crew Took Evasive Action
Aircraft; Human Factors
Unclear as to the cause of the warning; we believe we were clear of the terrain according to the lights we could see. The event took place at Roanoke airport at night on a visual approach to 24. The approach controller turned us towards Roanoke airport at 4000 FT. The runway was in sight we were cleared for a visual approach into 24. Upon descending out of 4000 FT we received a 'terrain pull up' aural warning. We executed the egpws procedure adding full power and pitching up. The controller leveled us off at 5000 FT and vectored us around for another approach. We were given a descent to 4000 FT; once level we were given vectors back to the airport. When we approached the same mountain range as before the 'terrain' aural warning sounded again. This time without the 'pull up'. As we were climbing to 5000; another aircraft was descending to 5;000 FT and given vectors away from us. They were never close enough for an 'RA' or 'TA'. We were then vectored for an ils 34 and landed.
[Report narrative contained no additional information.]
EMB-145 flight crew reported receiving a GPWS terrain warning on night visual approach to ROA. Crew stated they felt they were clear of terrain.