Traceroute is based on ICMP type 30 under Windows and UDP under *NIX; traceroute pacjets that would hit the firewall should be dropped similarly any echo replay coming from inside the firewall should be restricted outbound. The answer: traceroute can work via a firewall is firewall is allowing inbound ICMP type 30 and outbound echo reply.  !! this should be allowed via internal firewalls ONLY!!
a seconde case is allowing traceroute via firewall outbound with this I do not see any real problem as it can not be used for any device discovery or facilitate any malicious activity, unless being used for an attack coming from inside.

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This is the process of creating round trip opportunities for lift truck operators by identifying the ability to remove an outbound pallet from storage at a location close to the place where an inbound pallet was put away.