**EXHIBIT 21**

**QUIXOTECORPORATION AND SUBSIDIARIESSUBSIDIARIES OF THE COMPANYas of June 30, 2006**

|                                                           | ** ** | **Jurisdiction**     |
|-----------------------------------------------------------|------------|----------------------|
| ** **                                                | ** ** | **Under Which**      |
| **QUIXOTE  CORPORATION (PARENT)**                         | ** ** | ** **           | ** ** | **Organized** |
| Quixote Transportation  Safety, Inc.                 |       | Delaware             |
| TranSafe Corporation                                      |       | Delaware             |
| Nu-Metrics, Inc.                                     |       | Pennsylvania         |
| Highway Information  Systems, Inc.                   |       | Delaware             |
| Surface  Systems, Inc.                               |       | Missouri             |
| Sensing Systems, Ltd.                                     |       | United Kingdom       |
| U.S. Traffic Corporation                                  |       | Delaware             |
| Quixote Transportation  Safety Mexico S. de R.L. de C.V.  |       | Mexico               |
| Energy Absorption  Systems, Inc.                     |       | Delaware             |
| E-Tech Testing  Services, Inc.                       |       | Delaware             |
| Spin-Cast  Plastics, Inc.                            |       | Indiana              |
| Energy Absorption  Systems (Europe), Inc.            |       | Delaware             |
| Quixote Transportation  Safety (Asia Pacific) Pty Limited |       | Australia            |
| Quixote Asia  Pacific, Inc.                          |       | Delaware             |
| Quixote Europe, Inc.                                 |       | Delaware             |
| Energy Absorption  Systems (AL) LLC                       |       | Delaware             |
| Peek Traffic Corporation                                  |       | Delaware             |
| Quixote Traffic  Corporation                              |       | Delaware             |
| Quixote Transportation  Technologies, Inc.                |       | Delaware             |
| Quixote Foreign Sales  Corporation                        |       | U.S. Virgin  Islands |
| Quixote Latin American,  Inc.                             |       | Delaware             |
| Quixote Middle East/Africa, Inc.                          |       | Delaware             |
|                                                           |            |                      |  |  |

 

Quixote Transportation Safety, Inc., QuixoteTraffic Corporation, Quixote Transportation Technologies, Inc., QuixoteLatin America, Inc., Quixote Middle East/Africa, Inc. and QuixoteForeign Sales Corporation are wholly-owned by Quixote Corporation.

TranSafe Corporation, Surface Systems, Inc., U.S.Traffic Corporation, Peek Traffic Corporation and Energy Absorption Systems, Inc.are wholly-owned by Quixote Transportation Safety, Inc.

All subsidiaries listed under TranSafe Corporation,Surface Systems, Inc., U.S. Traffic Corporation and Energy AbsorptionSystems, Inc. are wholly-owned by those corporations.

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