Abu Hanzalah says that I asked Sayyiduna Ibn Umar (may Allah be pleased with them both) about the prayer during travel. He replied that during travel, the prayer is two rak'ahs. We said, "But now there is safety and security everywhere?" He replied: "This is the Sunnah of the Prophet (peace and blessings be upon him)."
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 4704
Hadith Gradingحکم دارالسلام:صحيح لغيره، وهذا إسناد حسن